Music Is Magic (1935)

Vaudevillians supporting the musical efforts of aging Hollywood star Diane de Valle decide to head for Tinseltown themselves when de Valle's high salary and low drawing power cancel the revue. Managing to land roles in a de Valle musical movie, perky Peggy is rescued from the chorus line by the tricks of her boyfriend Jack, who uses bravado to usurp de Valle's role in favor of Peggy, who is more suited to the bouncy musical.