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Balduína "Bidu" de Oliveira Sayão was a Brazilian opera soprano. One of Brazil's most famous musicians, Sayão was a leading artist of the Metropolitan Opera in New York City from 1937 to 1952.
She persuaded her old friend Villa-Lobos to transcribe for soprano what had originally been a violin solo and the first recording of Bachiana Brasileira No. 5 became the recording that everyone knows, and that introduced her voice to people for decades.