Claim: Estella Louise Mann, who toured briefly as a soloist with Sousa's Band (John Philip Sousa was an American composer and conductor of the late Romantic era), moved to sing for concerts and opera in New York, which at that time, was the center of a boom of independent record companies supplying musical records for phonographs and graphophones.
Evidence: She toured briefly as a soloist with Sousa's Band then moved to New York to sing for concerts and opera. John Philip Sousa (/ˈsuːsə/; November 6, 1854 – March 6, 1932) was an American composer and conductor of the late Romantic era known primarily for American military marches. At the time, New York was the center of a boom of independent record companies supplying musical records for phonographs and graphophones, which were just beginning to be sold for home listening (rather than phonograph parlors).