Claim: Estella Louise Mann (who toured briefly as a soloist with Sousa's Band) 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. 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).