Maria Callas (Greek name: Μαρία Καλογεροπούλου; December 2, 1923 – September 16, 1977) was an American-born Greek soprano and perhaps the best-known opera singer of the post-World War II period. She combined an impeccable bel canto technique with great dramatic gifts, making her the most famous singing actress of the era. An extremely versatile singer, her repertoire ranged from classical opera seria, such as Spontini's La Vestale to late Verdi and the verismo operas of Puccini.
Born Maria Anna Sofia Cecilia Kalogeropoulos to Greek parents in Brooklyn, New York, she moved with her mother to Athens, Greece at the age of 13. There she received her musical education and became a pupil of the well-known soprano Elvira de Hidalgo at the Athens Conservatory. After a few appearances as a student and in secondary roles, she made her professional debut at the Athens Opera on July 4, 1941, as Tosca, going on to sing Santuzza and Leonora during the next three years. In 1947, Callas made her Italian debut at the Verona Arena in La Gioconda under the baton of Tullio Serafin. Together with Serafin, Callas subsequently recorded and performed many bel canto operas, contributing greatly to the bel canto revival of the 1950s.