As this recital amply demonstrates, Maria Callas encompassed an extraordinary range of roles. She is as convincing in the pinpoint coloratura of Lakmé's 'Bell Song' ('Her chromatic scale is beautifully done and she sails up to the region known as in alt with the greatest ease,' said Gramophone) as in the sweeping, richly coloured lines of Maddalena's 'La mamma morta' from Andrea Chénier, famously and movingly featured on the soundtrack of the 1993 Hollywood film Philadelphia.'There is great tenderness and simplicity, deep emotion,and the most lovely moulding of the vocal phrases,' wrote Gramophone, 'Madame Callas's characterizations… are nothing less than superb, and altogether there is some of her finest singing yet recorded'.

Maria Callas’s recital discs occupy a central place in her recorded legacy, alongside her complete opera recordings. The Verdi featured three roles she had sung in the opera house: Abigaille, brimming with youthful and impressive vocal grandeur at the San Carlo in Naples in 1949 (her earliest complete live opera recording to have survived); Lady Macbeth at the opening of the 1952–3 La Scala season, one of her greatest triumphs (the live recording was reissued by EMI); and Elisabetta (Élisabeth de Valois) at La Scala in 1954 (of which we have no recording), a character whose aria ‘Tu che le vanità’ would become a central feature of the concerts she gave between 1959 and 1962.

This third Verdi collection was the last recital that Callas recorded, over an extended period between 1964 and 1969. Arias from operas in her stage repertoire – Aida, Un ballo in maschera, I vespri siciliani and Il trovatore – were complemented by numbers from more rarely heard works from Verdi’s ‘galley years’: When five of the tracks from this recital were originally released as Callas by Request, Gramophone admired the way: ‘Callas revealed her matchless command of line, verbal declamation and musical insight’.

The tracks on this album were recorded over a period of no less than 16 years. The earliest, the two versions of Donna Anna's 'Non mi dir', date from 1953, and were intended to test microphone placings before Callas made her first commercial recording for EMI: Lucia di Lammermoor. The latest, the Verdi arias recorded with Nicola Rescigno in 1964-1965 and 1969, were never approved for release by the soprano. When Callas Rarities was first released in 1993, Gramophone wrote: 'Each item, each phrase almost, has something to be said about it: the whole collection makes essential listening'.

Callas's second studio recording of La Gioconda was made in 1959, six years after her last stage performances of the role, which in 1947 has been the vehicle for her Italian debut (at the Arena di Verona).The recording came at a turning point in Callas's life - when her relationship with Aristotle Onassis led to her separation from her husband, Giovanni Battista Meneghini. Writing in Gramophone in 1960, Philip Hope-Wallace said: 'I simply cannot imagine anyone getting more out of the role than she does this time…the total effect is riveting.' Joining Callas were two young Italian singers destined for great careers: the mezzo-soprano Fiorenza Cossotto as her rival, Laura, and, as the sinister Barnaba, baritone Piero Cappuccilli.

‘Callas is Carmen’ proclaimed the publicity when this recording first appeared on LP in elaborate red and gold faux- leather luxury packaging with three separate booklets. It was a major coup for the record company to get Callas to record this most intriguing of all operatic roles, and its release was eagerly awaited…

Tosca was the role in which – in 1965, the year this recording was made – Callas gave her last complete performances at the Royal Opera House, Covent Garden, the Metropolitan Opera and the Paris Opéra. This was her final complete recording of an opera, and, 12 years after her first version of Tosca, it reunited her with the Scarpia of Tito Gobbi. They were joined by Carlo Bergonzi as Cavaradossi. Gramophone praised ‘a thrilling and very complete interpretation, with scene after scene, bar after bar, brought to life by sheer intelligence and dramatic insight’.

Madama Butterfly is an opera in three acts (originally two) by Giacomo Puccini, with an Italian libretto by Luigi Illica and Giuseppe Giacosa. It is based on the short story "Madame Butterfly" (1898) by John Luther Long, which in turn was based on stories told to Long by his sister Jennie Correll and on the semi-autobiographical 1887 French novel Madame Chrysanthème by Pierre Loti. Long's version was dramatized by David Belasco as the one-act play Madame Butterfly: A Tragedy of Japan, which, after premiering in New York in 1900, moved to London, where Puccini saw it in the summer of that year.

This 1960 Norma represents Maria Callas’s final complete documented version of her signature role. Seven recordings of the opera exist with Callas (1950-60), plus numerous snippets and scenes captured between 1949 and 1965. With 89 performances, Norma is Callas’s most performed part; certainly no other 20th-century diva is more closely associated with the role, and no one since has even remotely eclipsed Callas in the perception of opera lovers. Countless moments, too numerous to catalogue here, raise this Callas Norma to the level of genius. From a haunting ‘Casta Diva’ to a final scene of incomparable grandeur and sweep, in every startlingly brilliant detail, Callas is Norma.

One of the legendary moments in Callas's career came in 1950 in Mexico City, when she interpolated a stupendous top E flat at the end of the Triumphal Scene in Act II of Aida. In this recording under Serafin she abided by the score, but still prompted Gramophone to speak of her 'fascinating art and prodigious personality', observing the way she was 'rapt in imaginative intensity in the significance of the words'.

As she demonstrated in both Il barbiere di Siviglia and Il turco in Italia, Callas, the great tragedienne, could also turn her skills to comedy. As it happened, the 1956 La Scala production of Rossini's most popular opera did not prove a great success with audiences, but its stars - Callas, Tito Gobbi and Luigi Alva - reassembled in London the following year for this recording. Callas sang the role of Rosina at its original mezzo-soprano pitch and her version of 'Una voce poco fa' - punctuated by an unforgettable 'ma' ('but') in the cabaletta - is a miracle of both elegance and wit.

The role of the betrayed and finally murderous Medea became closely associated with Maria Callas. In 1969, several years after her final operatic performance, she even starred as Jason’s spurned wife – as an actress, not as a singer – in a film directed by Pier Paolo Pasolini. She first appeared in Cherubini’s opera in 1953 in Florence, with Vittorio Gui conducting, and later that year collaborated with Leonard Bernstein in a staging at La Scala; in 1962, the role brought her final appearances at Milan’s great opera house.

Callas never sang the role of Mimì on stage, but this did not prevent her recorded interpretation from being, as described by Philip Hope-Wallacein Gramophone, 'brilliantly realised… This Mimì comes alive and later haunts you in the most extraordinary way … one of the most moving I have ever heard.' Giuseppe di Stefano is anardent Rodolfo and the young Anna Moffomakes a delectable Musetta.

The fame and legacy of Maria Callas are nearly unsurpassed in the modern history of opera. Her fame has transcended the usual boundaries of classical music, and she has been the inspiration for several movies as well as the successful Broadway play "Master Class." Her extensive catalogue of recordings remains among the most coveted and controversial for both her fans and detractors. Though American by birth, Callas (born Maria Anne Sofia Cecilia Kalogeropoulos) was born of Greek parents, and at age 13 her mother took her back to Greece because of financial difficulties caused by the Great Depression.

The character of Gioconda is one of the most tragic in the whole history of Italian opera: an altruistic cantatrice who sacrifices everything, to the death, to secure the escape of the man she loves with her rival. Who was better suited than Maria Callas to assume such a role? La Gioconda, the only opera by Ponchielli that has not fallen into neglect, is a stunning transitional work between Verdian romanticism and verismo. La Divina particularly liked this opera.