Opera singers (left to right) Elīna Garanča, Helen Donath and Tamar Iveri perform in Mozart's opera Così fan tutte at the Salzburg Opera Festival. Andreas Schaad/AFP via Getty Images hide caption
Maria Callas
A hologram of the legendary soprano Maria Callas is currently touring North America and Europe. Evan Agostini/Base Hologram hide caption
Maria Callas: vocal chameleon, gossip-column staple and influential opera icon. Weston/Getty Images hide caption
Soprano Maria Callas at the Paris Opera in 1958. She is the subject of a new book, Maria by Callas. RDA/Getty Images hide caption
French conductor Georges Prêtre and the Vienna Philharmonic Orchestra perform a New Year's concert Jan. 1, 2008 in Vienna. Dieter Nagl/AFP/Getty Images hide caption
Maria Callas at home in her Milan Apartment, in 1958. One of 85,000 archive films British Pathé has uploaded to YouTube. British Pathé hide caption
Soprano Angela Meade made her professional debut in the role of Elvira in Verdi's Ernani at the Metropolitan Opera. Marty Sohl/Metropolitan Opera hide caption
Mozart's Queen of the Night (portrayed here by soprano Diana Damrau), in his The Magic Flute, is one of opera's more intense mothers. AFP/Getty Images hide caption
A diva on the town finds her way to NPR's new headquarters. Anya Grundmann/NPR hide caption
Maria Callas, a masterful bel canto singer, performs in the title role of Bellini's Norma in Paris, May 23, 1964. AFP/Getty Images hide caption
Is there good music that somehow isn't getting through to you? iStock hide caption
Soprano Angela Gheorghiu conjures the spirit (and the music) of the late diva Maria Callas on her new album. Cosmin Gogu/EMI Classics hide caption
Renata Scotto has retired from the stage, but she hasn't slowed down — she's now a director and costume designer. courtesy of the artist hide caption
Guest DJ Renata Scotto: Opera, Risks, And Keeping It Real
Soprano Natalie Dessay -- with the blood to prove it -- as the unhinged Lucia di Lammermoor. Gerard Ansellem/Opera de Lyon hide caption
More than 30 years after her death in 1977, Maria Callas' voice continues to thrill and divide fans and experts. EMI Classics hide caption