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In page Renata Tebaldi:

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Callas was a dramatic soprano, whereas Tebaldi considered herself essentially a lyric soprano. Callas and Tebaldi generally sang a different repertoire: in the early years of her career, Callas concentrated on the heavy dramatic soprano roles and later in her career on the bel canto repertoire, whereas Tebaldi concentrated on late Verdi and verismo roles. They shared a few roles, including Tosca in Puccini's opera and La Gioconda, which Tebaldi performed only late in her career.[citation needed]