Maria Callas is said to be one of the most controversial singers of the twentieth century. She was giving a series of masterclasses at the "Juilliard School of Music" in 1971 in New York. These masterclasses have got good success at that time. Most popular Maria Callas ringtones listed: Carmen - Habanera L'amour Est Un Oiseau Rebelle, Gianni Schicchi - O Mio Babbino Caro, La Boheme - O Soave Fanciulla, Madama Butterfly - Un Bel Di Vedremo, La Traviata - Sempre Libera, Aida - Ritorna Vincitor.