Balduína "Bidú" 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.
From Wikipedia (https://en.wikipedia.org/wiki/Bidu_Sayão) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/legalcode)