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Maria Callas (born Maria Anna Cecilia Sophia Kalogeropoulos; December 2, 1923 - September 16, 1977) was an American and Greek soprano, and one of the most renowned and influential opera singers of the 20th century. Critics praised her bel canto technique, wide-ranging voice, and dramatic interpretations. Her repertoire ranged from classical opera seria to the bel canto operas of Donizetti,

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