Hot Rhythm is a comedy film directed by William Beaudine. The film follows the stories of three central characters: Mary Adams (Dona Drake), Jimmy O'Brien (Robert Lowery), and Sammy Rubin (Sidney Miller). Jimmy and Sammy are professional jingle writers that choose to join with Mary in hopes of producing a successful mainstream album. The two decide to have Mary practice her vocals by allowing her to sing for the record of another band. The record is accidentally produced on a wide-scale, but proves to be surprisingly successful. Music icon Tommy Taylor (Jerry Cooper) hears Mary's work and tells his agent to sign her. However, the agent signs a secretary named Polly Kane (Irene Ryan). The music producer and owner of the studio that employs Jimmy and Sammy soon discovers the mishap but decides to punish Jimmy and Sammy. The two musicians are then left to try and prove their innocence so that they can continue working.