Maria Meneghini Callas

Maria Callas (born Maria Anna Cecilia Sophia Kalogeropoulos; December 2, 1923 – September 16, 1977) was an American and Greek soprano, and one of the most renowned and influential opera singers of the 20th century. Critics praised her bel canto technique, wide-ranging voice, and dramatic interpretations. Her repertoire ranged from classical opera seria to the bel canto operas of Donizetti, Bellini, and Rossini, and further to the works of Verdi and Puccini, and in her early career to the music dramas of Wagner. Her musical and dramatic talents led to her being hailed as La Divina ("The Divine One").

Born in Manhattan and raised in Astoria, Queens, New York City, to Greek immigrant parents, she was raised by an overbearing mother who had wanted a son. Maria received her musical education in Greece at age 13 and later established her career in Italy. Forced to deal with the exigencies of 1940s wartime poverty and with near-sightedness that left her nearly blind on stage, she endured struggles and scandal over the course of her career. She underwent a mid-career weight loss, which might have contributed to her vocal decline and the premature end of her career.

The press exulted in publicizing Callas's temperamental behavior, the alleged Callas–Tebaldi rivalry, and her love affair with Greek shipping tycoon Aristotle Onassis. Onassis's wife, Athina "Tina" Onassis Niarchos, divorced him when she discovered that he was having an affair with Callas.

Although her dramatic life and personal tragedy have often overshadowed Callas the artist in the popular press, her artistic achievements were such that Leonard Bernstein called her "the Bible of opera", and her influence so enduring that, in 2006, Opera News wrote of her: "Nearly thirty years after her death, she's still the definition of the diva as artist—and still one of classical music's best-selling vocalists."

Her ashes were scattered over the Aegean Sea on 3 June 1979, fulfilling one of her last wishes.

The name on Callas's New York birth certificate is Sophie Cecilia Kalos, although she was christened Maria Anna Cecilia Sophia Kalogeropoulos (Greek: Μαρία Άννα Καικιλία Σοφία Καλογεροπούλου). She was born at Flower Fifth Avenue Hospital (now the Terence Cardinal Cooke Health Care Center) on December 2, 1923, to Greek parents Elmina Evangelia "Litsa" (née Demes, originally Dimitriadou; c. 1894–1982) and George Kalogeropoulos (c. 1881–1972). Her mother was born in the town of Stylida in Phthiotis, and her father was born in the village of Neochori, near Meligalas in Messenia. He had shortened the surname Kalogeropoulos, first to Kalos and subsequently to Callas to make it more manageable.

George and Litsa Callas were an ill-matched couple from the beginning. George was easy-going and unambitious, with no interest in the arts, and Litsa was vivacious and socially ambitious and had dreamed of a life in the arts, which her middle-class parents had stifled in her childhood and youth. Litsa's father, Petros Dimitriadis (1852–1916), was in failing health when Litsa introduced George to her family. Petros, distrustful of George, warned his daughter, "You will never be happy with him. If you marry that man, I will never be able to help you." Litsa ignored his warning but soon realized that her father was right. The situation was aggravated by George's philandering and was improved neither by the birth of their daughter Yakinthi (later called "Jackie"), in 1917, nor the birth of their son Vassilis, in 1920. Vassilis's death from meningitis in the summer of 1922 dealt another blow to the marriage.

Callas's relationship with her mother continued to erode during the years in Greece, and in the prime of her career it became a matter of great public interest, especially after a 1956 cover story in Time magazine, which focused on their relationship, and later by Litsa's book, My Daughter Maria Callas (1960). In public, Callas recalls the strained relationship with Litsa and her unhappy childhood spent singing and working at her mother's insistence, saying,

My sister was slim and beautiful and friendly, and my mother always preferred her. I was the ugly duckling, fat and clumsy and unpopular. It is a cruel thing to make a child feel ugly and unwanted ... I'll never forgive her for taking my childhood away. During all the years, I should have been playing and growing up, I was singing or making money. Everything I did for them was mostly good and everything they did to me was mostly bad.

Callas received her musical education in Athens. Initially, her mother tried to enroll her at the prestigious Athens Conservatoire, without success. At the audition, her voice, still untrained, failed to impress, and the conservatoire's director Filoktitis Oikonomidis refused to accept her without her satisfying the theoretic prerequisites (solfege). In the summer of 1937, her mother visited Maria Trivella at the younger Greek National Conservatoire, asking her to take Mary, as she was then called, as a student for a modest fee. In 1957, Trivella recalled her impression of "Mary, a very plump young girl, wearing big glasses for her myopia":

The tone of the voice was warm, lyrical, intense; it swirled and flared like a flame and filled the air with melodious reverberations like a carillon. It was by any standards an amazing phenomenon, or rather it was a great talent that needed control, technical training and strict discipline in order to shine with all its brilliance.

Trivella agreed to tutor Callas, completely waiving her tuition fees, but no sooner had Callas started her formal lessons and vocal exercises than Trivella began to feel that Callas was not a contralto, as she had been told, but a dramatic soprano. Subsequently, they began working on raising the tessitura of her voice and to lighten its timbre. Trivella recalled Callas as

A model student. Fanatical, uncompromising, dedicated to her studies heart and soul. Her progress was phenomenal. She studied five or six hours a day. ... Within six months, she was singing the most difficult arias in the international opera repertoire with the utmost musicality.

On April 11, 1938, in her public debut, Callas ended the recital of Trivella's class at the Parnassos music hall with a duet from Tosca. Callas recalled that Trivella

After several appearances as a student, Callas began appearing in secondary roles at the Greek National Opera. De Hidalgo was instrumental in securing roles for her, allowing Callas to earn a small salary, which helped her and her family get through the difficult war years.

Callas made her professional debut in February 1941, in the small role of Beatrice in Franz von Suppé's Boccaccio. Soprano Galatea Amaxopoulou, who sang in the chorus, later recalled, "Even in rehearsal, Maria's fantastic performing ability had been obvious, and from then on, the others started trying ways of preventing her from appearing." Fellow singer Maria Alkeou similarly recalled that the established sopranos Nafsika Galanou and Anna (Zozó) Remmoundou "used to stand in the wings while [Callas] was singing and make remarks about her, muttering, laughing, and point their fingers at her".

Despite these hostilities, Callas managed to continue and made her debut in a leading role in August 1942 as Tosca, going on to sing the role of Marta in Eugen d'Albert's Tiefland at the Olympia Theatre. Callas's performance as Marta received glowing reviews. Critic Spanoudi declared Callas "an extremely dynamic artist possessing the rarest dramatic and musical gifts", and Evangelos Magkliveras evaluated Callas's performance for the weekly To Radiophonon:

The singer who took the part of Marta, that new star in the Greek firmament, with a matchless depth of feeling, gave a theatrical interpretation well up to the standard of a tragic actress. About her exceptional voice with its astonishing natural fluency, I do not wish to add anything to the words of Alexandra Lalaouni: 'Kalogeropoulou is one of those God-given talents that one can only marvel at.'

Following these performances, even Callas's detractors began to refer to her as "The God-Given". Some time later, watching Callas rehearse Beethoven's Fidelio, rival soprano Anna Remoundou asked a colleague "Could it be that there is something divine and we haven't realized it?" Following Tiefland, Callas sang the role of Santuzza in Cavalleria rusticana again and followed it with O Protomastoras (Manolis Kalomiris) at the ancient Odeon of Herodes Atticus at the foot of the Acropolis.

After returning to the United States and reuniting with her father in September 1945, Callas made the round of auditions. In December of that year, she auditioned for Edward Johnson, general manager of the Metropolitan Opera, and was favorably received: "Exceptional voice—ought to be heard very soon on stage".

Callas said that the Metropolitan Opera offered her Madama Butterfly and Fidelio, to be performed in Philadelphia and sung in English, both of which she declined, saying that she felt too fat for Butterfly and did not like the idea of opera in English. Although this offer is not documented in the Met's records, in a 1958 interview with the New York Post, Johnson confirmed that a contract was offered: "... but she didn't like it—because of the contract, not because of the roles. She was right in turning it down—it was frankly a beginner's contract."

In 1946, Callas was engaged to re-open the opera house in Chicago as Turandot, but the company folded before opening. Basso Nicola Rossi-Lemeni, who also was to star in this opera, was aware that Tullio Serafin was looking for a dramatic soprano to cast as La Gioconda at the Arena di Verona. He later recalled the young Callas as being "amazing—so strong physically and spiritually; so certain of her future. I knew in a big outdoor theatre like Verona's, this girl, with her courage and huge voice, would make a tremendous impact." Subsequently he recommended Callas to retired tenor and impresario Giovanni Zenatello. During her audition, Zenatello became so excited that he jumped up and joined Callas in the act 4 duet.

It was in this role that Callas made her Italian debut. Upon her arrival in Verona, Callas met Giovanni Battista Meneghini, an older, wealthy industrialist, who began courting her. They married in 1949, which gave her automatic Italian citizenship, and he assumed control of her career until 1959, when the marriage dissolved. It was Meneghini's love and support that gave Callas the time needed to establish herself in Italy, and throughout the prime of her career, she went by the name of Maria Meneghini Callas.

After La Gioconda, Callas had no offers, and when Serafin, looking for someone to sing Isolde, called on her, she told him that she already knew the score, even though she had looked at only the first act out of curiosity while at the conservatory. She sang the opera's second act for Serafin, who praised her for knowing the role so well, whereupon she admitted to having just then sight-read the music. Even more impressed, Serafin immediately cast her in the role. Serafin thereafter served as Callas's mentor and supporter.

Lord Harewood stated "Very few Italian conductors have had a more distinguished career than Tullio Serafin, and perhaps none, apart from Toscanini, more influence". In 1968, Callas recalled that working with Serafin was the "really lucky" opportunity of her career because "he taught me that there must be an expression; that there must be a justification. He taught me the depth of music, the justification of music. That's where I really really drank all I could from this man".

The great turning point, in Callas's career, occurred in Venice in 1949. She was engaged to sing the role of Brünnhilde, in Die Walküre, at the Teatro la Fenice, when Margherita Carosio, who was engaged to sing Elvira in I puritani, in the same theatre, fell ill. Unable to find a replacement for Carosio, Serafin told Callas that she would be singing Elvira in six days. When Callas protested that she not only did not know the role, but also had three more Brünnhildes to sing, he told her "I guarantee that you can". Michael Scott's words, "the notion of any one singer embracing music as divergent in its vocal demands as Wagner's Brünnhilde and Bellini's Elvira in the same career would have been cause enough for surprise; but to attempt to essay them both in the same season seemed like folie de grandeur".

Before the performance actually took place, one incredulous critic snorted, "We hear that Serafin has agreed to conduct I puritani with a dramatic soprano ... When can we expect a new edition of La traviata with [male baritone] Gino Bechi's Violetta?" After the performance, one critic wrote, "Even the most sceptical had to acknowledge the miracle that Maria Callas accomplished ... the flexibility of her limpid, beautifully poised voice, and her splendid high notes. Her interpretation also has a humanity, warmth and expressiveness that one would search for in vain in the fragile, pellucid coldness of other Elviras." Franco Zeffirelli recalled, "What she did in Venice was really incredible. You need to be familiar with opera to realize the size of her achievement. It was as if someone asked Birgit Nilsson, who is famous for her great Wagnerian voice, to substitute overnight for Beverly Sills, who is one of the great coloratura sopranos of our time."

Scott asserts that "Of all the many roles Callas undertook, it is doubtful if any had a more far-reaching effect." This initial foray into the bel canto repertoire changed the course of Callas's career and set her on a path leading to Lucia di Lammermoor, La traviata, Armida, La sonnambula, Il pirata, Il turco in Italia, Medea, and Anna Bolena, and reawakened interest in the long-neglected operas of Cherubini, Bellini, Donizetti and Rossini.

In the words of soprano Montserrat Caballé:

She opened a new door for us, for all the singers in the world, a door that had been closed. Behind it was sleeping not only great music but great idea of interpretation. She has given us the chance, those who follow her, to do things that were hardly possible before her. That I am compared with Callas is something I never dared to dream. It is not right. I am much smaller than Callas.

Although by 1951, Callas had sung at all the major theatres in Italy, she had not yet made her official debut at Italy's most prestigious opera house, Teatro alla Scala in Milan. According to composer Gian Carlo Menotti, Callas had substituted for Renata Tebaldi in the role of Aida in 1950, and La Scala's general manager, Antonio Ghiringhelli, had taken an immediate dislike to Callas.

Menotti recalls that Ghiringhelli had promised him any singer he wanted for the premiere of The Consul, but when he suggested Callas, Ghiringhelli said that he would never have Callas at La Scala except as a guest artist. However, as Callas's fame grew, and especially after her great success in I vespri siciliani in Florence, Ghiringhelli had to relent: Callas made her official debut at La Scala in Verdi's I vespri siciliani on opening night in December 1951, and this theatre became her artistic home throughout the 1950s. La Scala mounted many new productions specially for Callas by directors including Herbert von Karajan, Margherita Wallmann, Franco Zeffirelli and, most importantly, Luchino Visconti. Visconti stated later that he began directing opera only because of Callas, and he directed her in lavish new productions of La vestale, La traviata, La sonnambula, Anna Bolena and Iphigénie en Tauride. Callas was instrumental in arranging Franco Corelli's debut at La Scala in 1954, where he sang Licinio in Spontini's La vestale opposite Callas's Julia. The two had sung together for the first time the year previously in Rome in a production of Norma. Anthony Tommasini wrote that Corelli had "earned great respect from the fearsomely demanding Callas, who, in Mr Corelli, finally had someone with whom she could act." The two collaborated several more times at La Scala, singing opposite each other in productions of Fedora (1956), Il pirata (1958) and Poliuto (1960). Their partnership continued throughout the rest of Callas's career.

The night of the day she married Meneghini in Verona, she sailed for Argentina to sing at the Teatro Colón in Buenos Aires. Callas made her South American debut in Buenos Aires on May 20, 1949, during the European summer opera recess. Aida, Turandot and Norma roles were directed by Serafin, supported by Mario Del Monaco, Fedora Barbieri and Nicola Rossi-Lemeni. These were her only appearances on this world-renowned stage. Her debut in the United States was five years later in Chicago in 1954, and "with the Callas Norma, Lyric Opera of Chicago was born."

Her Metropolitan Opera debut, opening the Met's seventy-second season on October 29, 1956, was again with Norma, but was preceded by an unflattering cover story in Time magazine, which rehashed all of the Callas clichés, including her temper, her supposed rivalry with Renata Tebaldi, and especially her difficult relationship with her mother. As she had done with Lyric Opera of Chicago, on November 21, 1957, Callas gave a concert to inaugurate what then was billed as the Dallas Civic Opera, and helped establish that company with her friends from Chicago, Lawrence Kelly and Nicola Rescigno. She further consolidated this company's standing when, in 1958, she gave "a towering performance as Violetta in La traviata, and that same year, in her only American performances of Medea, gave an interpretation of the title role worthy of Euripides."

In 1958, a feud with general manager Rudolf Bing led to Callas's Metropolitan Opera contract being cancelled. Impresario Allen Oxenburg realised that this situation provided him with an opportunity for his own company, the American Opera Society, and he accordingly approached her with a contract to perform Imogene in Il pirata. She accepted and sang the role in a January 1959 performance that according to opera critic Allan Kozinn "quickly became legendary in operatic circles". Bing and Callas later reconciled their differences, and she returned to the Met in 1965 to sing the title role in two performances as Tosca opposite Franco Corelli as Cavaradossi for one performance (March 19, 1965) and Richard Tucker (March 25, 1965) with Tito Gobbi as Scarpia for her final performances at the Met.

In the early years of her career, Callas was a heavy woman; in her own words, "Heavy—one can say—yes I was; but I'm also a tall woman, 5' 8+1⁄2" (1.74 m), and I used to weigh no more than 200 pounds (90 kilograms)." Tito Gobbi relates that during a lunch break while recording Lucia in Florence, Serafin commented to Callas that she was eating too much and allowing her weight to become a problem. When she protested that she was not so heavy, Gobbi suggested she should "put the matter to test" by stepping on the weighing machine outside the restaurant. The result was "somewhat dismaying, and she became rather silent." In 1968, Callas told Edward Downes that during her initial performances in Cherubini's Medea in May 1953, she realized that she needed a leaner face and figure to do dramatic justice to this as well as the other roles she was undertaking. She added,

I was getting so heavy that even my vocalizing was getting heavy. I was tiring myself, I was perspiring too much, and I was really working too hard. And I wasn't really well, as in health; I couldn't move freely. And then I was tired of playing a game, for instance playing this beautiful young woman, and I was heavy and uncomfortable to move around. In any case, it was uncomfortable and I didn't like it. So I felt now if I'm going to do things right—I've studied all my life to put things right musically, so why don't I diet and put myself into a certain condition where I'm presentable.

During 1953 and early 1954, she lost almost 80 pounds (36 kg), turning herself into what Rescigno called "possibly the most beautiful lady on the stage." Various rumors spread regarding her weight loss method; one had her swallowing a tapeworm, and Rome's Panatella Mills pasta company claimed she lost weight by eating their "physiologic pasta," prompting Callas to file a lawsuit. Callas stated that she lost the weight by eating a sensible low-calorie diet of mainly salads and chicken. Callas never regained the weight she lost and kept her slim figure until her death.

Some believe that the loss of body mass made it more difficult for her to support her voice, triggering the vocal strain that became apparent later in the decade, and others believed the weight loss effected a newfound softness and femininity in her voice, as well as a greater confidence as a person and performer. Tito Gobbi said,

Now she was not only supremely gifted both musically and dramatically—she was a beauty too. And her awareness of this invested with fresh magic every role she undertook. What it eventually did to her vocal and nervous stamina I am not prepared to say. I only assert that she blossomed into an artist unique in her generation and outstanding in the whole range of vocal history.

In the opinion of several singers, the heavy roles undertaken in her early years damaged Callas's voice. The mezzo-soprano Giulietta Simionato, Callas's close friend and frequent colleague, stated that she told Callas that she felt that the early heavy roles led to a weakness in the diaphragm and subsequent difficulty in controlling the upper register.

Louise Caselotti, who worked with Callas in 1946 and 1947, prior to her Italian debut, felt that it was not the heavy roles that hurt Callas's voice, but the lighter ones. Several singers have suggested that Callas's heavy use of the chest voice led to stridency and unsteadiness with the high notes. In his book, Callas's husband Meneghini wrote that Callas suffered an unusually early onset of menopause, which could have affected her voice. Soprano Carol Neblett once said, "A woman sings with her ovaries—you're only as good as your hormones."

Critic Henry Pleasants has stated that it was a loss of physical strength and breath-support that led to Callas's vocal problems, saying,Singing, and especially opera singing, requires physical strength. Without it, the singer's respiratory functions can no longer support the steady emissions of breath essential to sustaining the production of focused tone. The breath escapes, but it is no longer the power behind the tone, or is only partially and intermittently. The result is a breathy sound—tolerable but hardly beautiful—when the singer sings lightly, and a voice spread and squally when under pressure.

In the same vein, Joan Sutherland, who heard Callas throughout the 1950s, said in a BBC interview,

[Hearing Callas in Norma in 1952] was a shock, a wonderful shock. You just got shivers up and down the spine. It was a bigger sound in those earlier performances, before she lost weight. I think she tried very hard to recreate the sort of "fatness" of the sound which she had when she was as fat as she was. But when she lost the weight, she couldn't seem to sustain the great sound that she had made, and the body seemed to be too frail to support that sound that she was making. Oh, but it was oh so exciting. It was thrilling. I don't think that anyone who heard Callas after 1955 really heard the Callas voice.

A 2010 study by Italian vocal researchers Franco Fussi and Nico Paolillo revealed Callas was very ill at the time of her death and her illness was related to her vocal deterioration. According to their findings, presented at the University of Bologna in 2010, Callas had dermatomyositis, a rare connective tissue disease that causes a failure of the muscles and ligaments, including the larynx. They believe she was showing signs of this disease as early as the 1960s. Fussi and Paolillo cite an initial report by physician Mario Giacovazzo, who in 2002 revealed he had diagnosed Callas with dermatomyositis in 1975. Treatment included corticosteroids and immunosuppressive agents, which affect heart function.

At an event hosted by the journal Il Saggiatore Musicale, Fussi and Paolillo presented documentation showing when and how her voice changed over time. Using modern audio technology, they analyzed live Callas studio recordings from the 1950s through the 1970s, looking for signs of deterioration. Spectrographic analysis showed that she was losing the top half of her range. Fussi observed video recordings in which Callas's posture seemed strained and weakened. He felt that her drastic weight loss in 1954 further contributed to reduced physical support of her voice.

Fussi and Paolillo also examined restored footage of the infamous 1958 Norma "walkout" in Rome, which led to harsh criticism of Callas as a temperamental superstar. By applying spectrographic analysis to that footage, the researchers observed her voice was tired and she lacked control and that she had bronchitis and tracheitis as she claimed, and that the dermatomyositis was already causing her muscles to deteriorate.

In 1957, while still married to husband Giovanni Battista Meneghini, Callas was introduced to Greek shipping magnate Aristotle Onassis at a party given in her honor by Elsa Maxwell after a performance in Donizetti's Anna Bolena. The affair that followed received much publicity in the popular press, and in November 1959, Callas left her husband. Michael Scott asserts that Onassis was not sure why Callas largely abandoned her career, but that he offered her a way out of a career that was made increasingly difficult by scandals and by vocal resources that were diminishing at an alarming rate. Franco Zeffirelli, on the other hand, recalls asking Callas in 1963 why she had not practiced her singing, and Callas responding that "I have been trying to fulfill my life as a woman."

According to one of her biographers, Nicholas Gage, Callas and Onassis had a child, a boy, who died hours after he was born on March 30, 1960. In his book about his wife, Meneghini states categorically that Maria Callas was unable to bear children. Various sources also dismiss Gage's claim, as they note that the birth certificates Gage used to prove this "secret child" were issued in 1998, twenty-one years after Callas's death. Still other sources claim that Callas had at least one abortion while involved with Onassis.

In 1966, Callas renounced her U.S. citizenship at the American Embassy in Paris, to facilitate the end of her marriage to Meneghini. This was because after her renunciation, she was only a Greek citizen, and under Greek law of that time, a Greek could legally marry only in a Greek Orthodox church. As she had married in a Roman Catholic church, this divorced her in Greece. The renunciation also helped her finances, as she no longer had to pay U.S. taxes on her income. Her relationship with Onassis ended two years later in 1968, when he left Callas for Jacqueline Kennedy. However, the Onassis family's private secretary Kiki writes in her memoir that even while Aristotle was with Jackie, he frequently met Maria in Paris, where they resumed what had now become a clandestine affair.

Callas spent her last years living largely in isolation in Paris and died of a heart attack at the age of 53 on September 16, 1977.

A funerary liturgy was held at St Stephen's Greek Orthodox Cathedral on rue Georges-Bizet, Paris on September 20, 1977. She was later cremated at the Père Lachaise Cemetery and her ashes were placed in the columbarium there. After being stolen and later recovered, they were scattered over the Aegean Sea, off the coast of Greece, according to her wish, in the spring of 1979.

According to several Callas biographers, Vasso Devetzi, a Greek pianist near the same age as Callas, insinuated herself into Callas's trust during her last years and acted virtually as her agent. This claim is corroborated by Callas' sister Yakinthi "Jackie" in her 1990 book Sisters, wherein she asserts that Devetzi conned Maria out of control of half of her estate while promising to establish the Maria Callas Foundation to provide scholarships for young singers; after hundreds of thousands of dollars had allegedly vanished, Devetzi finally did establish the foundation.

Callas's voice elicited diverging reactions. Walter Legge stated that Callas possessed that most essential ingredient for a great singer: an instantly recognizable voice.

During "The Callas Debate", Italian critic Rodolfo Celletti stated, "The timbre of Callas' voice, considered purely as sound, was essentially ugly: it was a thick sound, which gave the impression of dryness, of aridity. It lacked those elements which, in a singer's jargon, are described as velvet and varnish ... yet I really believe that part of her appeal was precisely due to this fact. Why? Because for all its natural lack of varnish, velvet and richness, this voice could acquire such distinctive colours and timbres as to be unforgettable." However, in his review of Callas's 1951 live recording of I vespri siciliani, Ira Siff writes, "Accepted wisdom tells us that Callas possessed, even early on, a flawed voice, unattractive by conventional standards—an instrument that signaled from the beginning vocal problems to come. Yet listen to her entrance in this performance and one encounters a rich, spinning sound, ravishing by any standard, capable of delicate dynamic nuance. High notes are free of wobble, chest tones unforced, and the middle register displays none of the 'bottled' quality that became more and more pronounced as Callas matured."

Nicola Rossi-Lemeni relates that Callas's mentor Serafin used to refer to her as Una grande vociaccia; he continues, "Vociaccia is a little bit pejorative—it means an ugly voice—but grande means a big voice, a great voice. A great ugly voice, in a way." Callas did not like the sound of her own voice; in one of her last interviews, answering whether or not she was able to listen to her own voice, she replied,

Yes, but I don't like it. I have to do it, but I don't like it at all because I don't like the kind of voice I have. I really hate listening to myself! The first time I listened to a recording of my singing was when we were recording San Giovanni Battista by Stradella in a church in Perugia in 1949. They made me listen to the tape and I cried my eyes out. I wanted to stop everything, to give up singing... Also now even though I don't like my voice, I've become able to accept it and to be detached and objective about it so I can say, "Oh, that was really well sung," or "It was nearly perfect."

Carlo Maria Giulini has described the appeal of Callas's voice:

Callas's voice has been difficult to place in the modern vocal classification or Fach system, especially as in her prime her repertoire contained the heaviest dramatic soprano roles as well as roles usually undertaken by the highest, lightest and most agile coloratura sopranos. Regarding this versatility, Serafin said, "This woman can sing anything written for the female voice". Michael Scott argues that Callas's voice was a natural high soprano, and going by evidence of Callas's early recordings Rosa Ponselle likewise felt that "At that stage of its development, her voice was a pure but sizable dramatic coloratura—that is to say, a sizable coloratura voice with dramatic capabilities, not the other way around." On the other hand, music critic John Ardoin has argued that Callas was the reincarnation of the 19th-century soprano sfogato or "unlimited soprano", a throwback to Maria Malibran and Giuditta Pasta, for whom many of the famous bel canto operas were written. He avers that like Pasta and Malibran, Callas was a natural mezzo-soprano whose range was extended through training and willpower, resulting in a voice which "lacked the homogeneous color and evenness of scale once so prized in singing. There were unruly sections of their voices never fully under control. Many who heard Pasta, for example, remarked that her uppermost notes seemed produced by ventriloquism, a charge which would later be made against Callas". Ardoin points to the writings of Henry Chorley about Pasta which bear an uncanny resemblance to descriptions of Callas:

There was a portion of the scale which differed from the rest in quality and remained to the last 'under a veil.' ... out of these uncouth materials she had to compose her instrument and then to give it flexibility. Her studies to acquire execution must have been tremendous; but the volubility and brilliancy, when acquired, gained a character of their own ... There were a breadth, an expressiveness in her roulades, an evenness and solidity in her shake, which imparted to every passage a significance totally beyond the reach of lighter and more spontaneous singers ... The best of her audience were held in thrall, without being able to analyze what made up the spell, what produced the effect—as soon as she opened her lips.

Callas appears to have been in agreement not only with Ardoin's assertions that she started as a natural mezzo-soprano, but also saw the similarities between herself and Pasta and Malibran. In 1957, she described her early voice: "The timbre was dark, almost black—when I think of it, I think of thick molasses", and in 1968 she added, "They say I was not a true soprano, I was rather toward a mezzo". Regarding her ability to sing the heaviest as well as the lightest roles, she told James Fleetwood,

It's study; it's Nature. I'm doing nothing special, you know. Even Lucia, Anna Bolena, Puritani, all these operas were created for one type of soprano, the type that sang Norma, Fidelio, which was Malibran of course. And a funny coincidence last year, I was singing Anna Bolena and Sonnambula, same months and the same distance of time as Giuditta Pasta had sung in the nineteenth century ... So I'm really not doing anything extraordinary. You wouldn't ask a pianist not to be able to play everything; he has to. This is Nature and also because I had a wonderful teacher, the old kind of teaching methods ... I was a very heavy voice, that is my nature, a dark voice shall we call it, and I was always kept on the light side. She always trained me to keep my voice limber.

Regarding the sheer size of Callas's instrument, Rodolfo Celletti says, "Her voice was penetrating. The volume as such was average: neither small nor powerful. But the penetration, allied to this incisive quality (which bordered on the ugly because it frequently contained an element of harshness) ensured that her voice could be clearly heard anywhere in the auditorium." Celletti wrote that Callas had "a voluminous, penetrating, and dark voice" (una voce voluminosa, squillante e di timbro scuro). After her first performance of Medea in 1953, the critic for Musical Courier wrote that "she displayed a vocal generosity that was scarcely believable for its amplitude and resilience." In a 1982 Opera News interview with Joan Sutherland and Richard Bonynge, Bonynge stated, "But before she slimmed down, I mean this was such a colossal voice. It just poured out of her, the way Flagstad's did .... Callas had a huge voice. When she and Stignani sang Norma, at the bottom of the range you could barely tell who was who ... Oh it was colossal. And she took the big sound right up to the top." In his book, Michael Scott makes the distinction that whereas Callas's pre-1954 voice was a "dramatic soprano with an exceptional top", after the weight loss, it became, as one Chicago critic described the voice in Lucia, a "huge soprano leggiero".

In performance, Callas's vocal range was just short of three octaves, from F-sharp (F♯3) below middle C (C4) heard in "Arrigo! Ah parli a un core" from I vespri siciliani to E-natural (E6) above high C (C6), heard in the aria "Mercè, dilette amiche" in the final act of the same opera, as well as in Rossini's Armida and Lakmé's Bell Song. Whether or not Callas ever sang a high F-natural in performance has been open to debate. After her June 11, 1951, concert in Florence, Rock Ferris of Musical Courier said, "Her high E's and F's are taken full voice." Although no definite recording of Callas singing high Fs has surfaced, the presumed E-natural at the end of Rossini's Armida—a poor-quality bootleg recording of uncertain pitch—has been referred to as a high F by Italian musicologists and critics Eugenio Gara and Rodolfo Celletti. Callas expert Dr. Robert Seletsky, however, stated that since the finale of Armida is in the key of E, the final note could not have been an F, as it would have been dissonant. Author Eve Ruggieri has referred to the penultimate note in "Mercè, dilette amiche" from the 1951 Florence performances of I vespri siciliani as a high F; however, this claim is refuted by John Ardoin's review of the live recording of the performance as well as by the review of the recording in Opera News, both of which refer to the note as a high E-natural.

In a 1969 French television interview with Pierre Desgraupes on the program L'invitée du dimanche, Francesco Siciliani speaks of Callas's voice going to high F (he also talked about her lower register extending to C3), but within the same program, Callas's teacher, Elvira de Hidalgo, speaks of the voice soaring to a high E-natural but does not mention a high F. Callas remained silent on the subject, neither confirming nor denying either claim.

Callas's voice was noted for its three distinct registers: Her low or chest register was extremely dark and powerful, and she used this part of her voice for dramatic effect, often going into this register much higher on the scale than most sopranos. Her middle register had a peculiar and highly personal sound—"part oboe, part clarinet", as Claudia Cassidy described it—and was noted for its veiled or "bottled" sound, as if she were singing into a jug. Walter Legge, husband of diva Elisabeth Schwarzkopf, attributed this sound to the "extraordinary formation of her upper palate, shaped like a Gothic arch, not the Romanesque arch of the normal mouth".

The upper register was ample and bright, with an impressive extension above high C, which—in contrast to the light flute-like sound of the typical coloratura, "she would attack these notes with more vehemence and power—quite differently therefore, from the very delicate, cautious, 'white' approach of the light sopranos." Legge adds, "Even in the most difficult fioriture there were no musical or technical difficulties in this part of the voice which she could not execute with astonishing, unostentatious ease. Her chromatic runs, particularly downwards, were beautifully smooth and staccatos almost unfailingly accurate, even in the trickiest intervals. There is hardly a bar in the whole range of nineteenth-century music for high soprano that seriously tested her powers." And as she demonstrated in the finale of La sonnambula on the commercial EMI set and the live recording from Cologne, she was able to execute a diminuendo on the stratospheric high E-flat, which Scott describes as "a feat unrivaled in the history of the gramophone."

Regarding Callas's soft singing, Celletti says, "In these soft passages, Callas seemed to use another voice altogether, because it acquired a great sweetness. Whether in her florid singing or in her canto spianato, that is, in long held notes without ornamentation, her mezza voce could achieve such moving sweetness that the sound seemed to come from on high ... I don't know, it seemed to come from the skylight of La Scala."

This combination of size, weight, range and agility was a source of amazement to Callas's own contemporaries. One of the choristers present at her La Scala debut in I vespri siciliani recalled, "My God! She came on stage sounding like our deepest contralto, Cloe Elmo. And before the evening was over, she took a high E-flat. And it was twice as strong as Toti Dal Monte's!" In the same vein, mezzo-soprano Giulietta Simionato said: "The first time we sang together was in Mexico in 1950, where she sang the top E-flat in the second-act finale of Aida. I can still remember the effect of that note in the opera house—it was like a star!" For Italian soprano Renata Tebaldi, "the most fantastic thing was the possibility for her to sing the soprano coloratura with this big voice! This was something really special. Fantastic absolutely!"

Callas's vocal registers, however, were not seamlessly joined; Walter Legge writes, "Unfortunately, it was only in quick music, particularly descending scales, that she completely mastered the art of joining the three almost incompatible voices into one unified whole, but until about 1960, she disguised those audible gear changes with cunning skill." Rodolfo Celletti states,

Adored by many opera enthusiasts, Callas was a controversial artist. Although Callas was the great singer often dismissed simply as an actress, Callas considered herself foremost a musician, that is, the first instrument of the orchestra." Grace Bumbry has stated, "If I followed the musical score when [Callas] was singing, I would see every tempo marking, every dynamic marking, everything being adhered to, and at the same time, it was not antiseptic; it was something that was very beautiful and moving." Victor de Sabata confided to Walter Legge, "If the public could understand, as we do, how deeply and utterly musical Callas is, they would be stunned", and Serafin assessed Callas's musicality as "extraordinary, almost frightening." Callas possessed an innate architectural sense of line-proportion and an uncanny feel for timing and for what one of Callas's colleagues described as "a sense of the rhythm within the rhythm".

Regarding Callas's technical prowess, Celletti says, "We must not forget that she could tackle the whole gamut of ornamentation: staccato, trills, half-trills, gruppetti, scales, etc." D'Amico adds, "The essential virtue of Callas' technique consists of supreme mastery of an extraordinarily rich range of tone colour (that is, the fusion of dynamic range and timbre). And such mastery means total freedom of choice in its use: not being a slave to one's abilities, but rather, being able to use them at will as a means to an end." While reviewing the many recorded versions of "perhaps Verdi's ultimate challenge", the aria "D'amor sull'ali rosee" from Il trovatore, Richard Dyer writes,

Callas articulates all of the trills, and she binds them into the line more expressively than anyone else; they are not an ornament but a form of intensification. Part of the wonder in this performance is the chiaroscuro through her tone—the other side of not singing full-out all the way through. One of the vocal devices that create that chiaroscuro is a varying rate of vibrato; another is her portamento, the way she connects the voice from note to note, phrase to phrase, lifting and gliding. This is never a sloppy swoop, because its intention is as musically precise as it is in great string playing. In this aria, Callas uses more portamento, and in greater variety, than any other singer ... Callas is not creating "effects", as even her greatest rivals do. She sees the aria as a whole, "as if in an aerial view", as Sviatoslav Richter's teacher observed of his most famous pupil; simultaneously, she is on earth, standing in the courtyard of the palace of Aliaferia, floating her voice to the tower where her lover lies imprisoned.

In addition to her musical skills, Callas had a particular gift for language and the use of language in music. In recitatives, she always knew which word to emphasize and which syllable in that word to bring out. Michael Scott notes, "If we listen attentively, we note how her perfect legato enables her to suggest by musical means even the exclamation marks and commas of the text." Technically, not only did she have the capacity to perform the most difficult florid music effortlessly, but also she had the ability to use each ornament as an expressive device rather than for mere fireworks. Soprano Martina Arroyo states, "What interested me most was how she gave the runs and the cadenzas words. That always floored me. I always felt I heard her saying something—it was never just singing notes. That alone is an art." Walter Legge states that,

Most admirable of all her qualities, however, were her taste, elegance and deeply musical use of ornamentation in all its forms and complications, the weighting and length of every appoggiatura, the smooth incorporation of the turn in melodic lines, the accuracy and pacing of her trills, the seemingly inevitable timing of her portamentos, varying their curve with enchanting grace and meaning. There were innumerable exquisite felicities—minuscule portamentos from one note to its nearest neighbor, or over widespread intervals—and changes of color that were pure magic. In these aspects of bel canto she was supreme mistress of that art.

Regarding Callas's acting ability, vocal coach and music critic Ira Siff remarked, "When I saw the final two Toscas she did in the old [Met], I felt like I was watching the actual story on which the opera had later been based." Callas was not, however, a realistic or verismo style actress: her physical acting was merely "subsidiary to the heavy Kunst of developing the psychology of the roles under the supervision of the music, of singing the acting ... Suffering, delight, humility, hubris, despair, rhapsody—all this was musically appointed, through her use of the voice flying the text upon the notes." Seconding this opinion, verismo specialist soprano Augusta Oltrabella said, "Despite what everyone says, [Callas] was an actress in the expression of the music, and not vice versa."

In fact the essence of her art was refinement. The term seems odd for a performer whose imagination and means of expression were so prodigious. She was eminently capable of the grand gesture; still, judging strictly from the evidence of her recordings, we know (and her few existing film clips confirm) that her power flowed not from excess but from unbroken concentration, unfaltering truth in the moment. It flowed also from irreproachable musicianship. People say that Callas would not hesitate to distort a vocal line for dramatic effect. In the throes of operatic passion plenty of singers snarl, growl, whine, and shriek. Callas was not one of them. She found all she needed in the notes.

Ewa Podleś likewise stated that "It's enough to hear her, I'm positive! Because she could say everything only with her voice! I can imagine everything, I can see everything in front of my eye." Opera director Sandro Sequi, who witnessed many Callas performances close-up, states, "For me, she was extremely stylized and classic, yet at the same time, human—but humanity on a higher plane of existence, almost sublime. Realism was foreign to her, and that is why she was the greatest of opera singers. After all, opera is the least realistic of theater forms ... She was wasted in verismo roles, even Tosca, no matter how brilliantly she could act such roles." Scott adds, "Early nineteenth-century opera ... is not merely the antithesis of reality, it also requires highly stylized acting. Callas had the perfect face for it. Her big features matched its grandiloquence and spoke volumes from a distance."

In regard to Callas's physical acting style, Nicola Rescigno states, "Maria had a way of even transforming her body for the exigencies of a role, which is a great triumph. In La traviata, everything would slope down; everything indicated sickness, fatigue, softness. Her arms would move as if they had no bones, like the great ballerinas. In Medea, everything was angular. She'd never make a soft gesture; even the walk she used was like a tiger's walk." Sandro Sequi recalls, "She was never in a hurry. Everything was very paced, proportioned, classical, precise ... She was extremely powerful but extremely stylized. Her gestures were not many ... I don't think she did more than 20 gestures in a performance. But she was capable of standing 10 minutes without moving a hand or finger, compelling everyone to look at her." Edward Downes recalled Callas watching and observing her colleagues with such intensity and concentration as to make it seem that the drama was all unfolding in her head. Sir Rudolf Bing similarly recalled that in Il trovatore in Chicago, "it was Callas' quiet listening, rather than Björling's singing that made the dramatic impact ... He didn't know what he was singing, but she knew."

Callas stated that, in opera, acting must be based on the music, quoting Serafin's advice to her:

Callas's most distinguishing quality was her ability to breathe life into the characters she portrayed, or in the words of Matthew Gurewitsch, "Most mysterious among her many gifts, Callas had the genius to translate the minute particulars of a life into tone of voice." Italian critic Eugenio Gara adds:

Her secret is in her ability to transfer to the musical plane the suffering of the character she plays, the nostalgic longing for lost happiness, the anxious fluctuation between hope and despair, between pride and supplication, between irony and generosity, which in the end dissolve into a superhuman inner pain. The most diverse and opposite of sentiments, cruel deceptions, ambitious desires, burning tenderness, grievous sacrifices, all the torments of the heart, acquire in her singing that mysterious truth, I would like to say, that psychological sonority, which is the primary attraction of opera.

Ethan Mordden writes, "It was a flawed voice. But then Callas sought to capture in her singing not just beauty but a whole humanity, and within her system, the flaws feed the feeling, the sour plangency and the strident defiance becoming aspects of the canto. They were literally defects of her voice; she bent them into advantages of her singing." Giulini believes, "If melodrama is the ideal unity of the trilogy of words, music, and action, it is impossible to imagine an artist in whom these three elements were more together than Callas." He recalls that during Callas's performances of La traviata, "reality was onstage. What stood behind me, the audience, auditorium, La Scala itself, seemed artifice. Only that which transpired on stage was truth, life itself." Sir Rudolf Bing expressed similar sentiments:Once one heard and saw Maria Callas—one can't really distinguish it—in a part, it was very hard to enjoy any other artist, no matter how great, afterwards, because she imbued every part she sang and acted with such incredible personality and life. One move of her hand was more than another artist could do in a whole act.

To Antonino Votto, Callas was:The last great artist. When you think this woman was nearly blind, and often sang standing a good 150 feet from the podium. But her sensitivity! Even if she could not see, she sensed the music and always came in exactly with my downbeat. When we rehearsed, she was so precise, already note-perfect ... She was not just a singer, but a complete artist. It's foolish to discuss her as a voice. She must be viewed totally—as a complex of music, drama, movement. There is no one like her today. She was an esthetic phenomenon.

Terrence McNally's play Master Class, which premiered in 1995, presents Callas as a glamorous, commanding, larger-than-life, caustic, and funny pedagogue holding a voice master class. Alternately dismayed and impressed by the students who parade before her, she retreats into recollections about the glories of her own life and career, culminating in a monologue about sacrifice taken for art. Several selections of Callas actually singing are played during the recollections. Callas was portrayed on Broadway by Zoe Caldwell (1995), Patti LuPone (1996), Dixie Carter (1997), and Tyne Daly (2011). Caldwell won a Tony Award for her performance. Faye Dunaway starred in the 1996 national tour.

Terrence McNally's play The Lisbon Traviata, which premiered in 1985 at the Manhattan Theatre Club, uses Maria Callas's celebrated recordings of Verdi's La traviata as a recurring point of reference in a story about friendship, romantic relationships, and opera fandom. The opening scene famously revolves around an argument over rival recordings of the opera, with her portrayal of Violetta held up as the standard against which other interpretations are judged.

In 1997, she was featured as one of 18 significant historical figures in Apple Inc.'s Think different advertisement.

In 2002, Franco Zeffirelli produced and directed a biopic, Callas Forever. It was a fictionalized film in which Callas was played by Fanny Ardant. It depicted the last months of Callas's life, when she was seduced into the making of a movie of Carmen, lip-synching to her 1964 recording of that opera.

In 2007, Callas was posthumously awarded the Grammy Lifetime Achievement Award. In the same year, she was voted the greatest soprano of all time by BBC Music Magazine.

Callas's stage repertoire included the following roles:

All recordings are in mono unless otherwise indicated. Live performances are typically available on multiple labels. In 2014, Warner Classics (formerly EMI Classics) released the Maria Callas Remastered Edition, consisting of her complete studio recordings totaling 39 albums in a boxed set remastered at Abbey Road Studios in 24-bit/96 kHz digital sound from original master tapes.

Verdi, Nabucco, conducted by Vittorio Gui, live performance, Napoli, December 20, 1949

Verdi, Il trovatore, conducted by Guido Picco, live performance, Mexico City, June 20, 1950. In the aria "D'amor sull'ali rosee", Callas sings Verdi's original high D flat, likewise in her 1951 San Carlo performance.

Wagner, Parsifal, live performance conducted by Vittorio Gui, RAI Rome, November 20/21, 1950 (Italian)

Verdi, Il trovatore, live performance conducted by Tullio Serafin, Teatro San Carlo, Naples, January 27, 1951