Piano Concerto No.23 in A major (1) Wolfgang Amadeus Mozart
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Maria Callas: 15 facts about the great soprano
Callas’s teacher described her 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."