Swing!

Mandy Jenkins, an African American cook for a wealthy white family in Birmingham, Alabama, discovers her husband Cornell is having an affair with Eloise Jackson. When she confronts her husband and Eloise at a nightclub, a violent fight ensues. Eloise leaves Birmingham and relocates to Harlem, getting a job as a cabaret vocalist under the stage name Cora Smith. She is followed to Harlem by her husband, Lem, who gets mixed up in the local crime scene. Mandy also arrives in New York, having left Cornell. She gets a job as the wardrobe mistress at the cabaret where Eloise is performing. When Eloise breaks her leg during a drunken fall, Mandy is recruited as a last-minute substitute. (Adapted from Wikipedia.) This film was released without copyright notice, nor was it ever registered with the copyright office. Thus, it is and always has been in the public domain.