The Three Stooges "Micro Phonies"- (1945)

The boys are radio station janitors being chewed out by their boss. Fleeing from him after a disastrous attempt to repair a radiator, they end up in a recording studio. There, Curly (in drag) is mistaken for an opera singer by a woman who sees the boys lip-synching to a recording made earlier in the day by Alice Andrews (Christine McIntyre). Alice, against her father's wishes, wants a career as a radio singer. Hired to sing at a party that night, the Stooges bump into Signor Spumoni, who recognizes them as fakes. With Alice's help, the boys continue the masquerade... but not if Spumoni has anything to say about it!