Jimmy Haskell (James Stewart) closes his struggling music store and goes into business with his wealthy uncle, C.J. (Charles Winninger), who owns a health food business. C.J. hates music and has constant disputes with the McCorkle family, who run a boarding house across the alley from C.J.'s factory and play in Horace Heidt's (himself) band, which currently lives in the boarding house. When Jimmy unintentionally throws a tomato at C.J. during a dispute, it impresses the McCorkles and the band, who don't know that Jimmy is related to C.J. Molly McCorkle (Paulette Goddard) quickly falls for Jimmy. When Jimmy must substitute for C.J. on his radio program, he is confronted by Horace and Molly's brother, Willie (Dick Hogan). Jimmy admits to his identity but works with Horace and Willie to trick C.J. into taking an extended vacation by making C.J. think only he can hear music being played by the band from a hidden location. Jimmy uses the opportunity to have the band play on the radio program to great success, but Molly learns Jimmy's identity and angrily states on air that the radio show will give away $1,000 every week. To protect Molly, Jimmy claims the idea is his, but must now find a legal way to fulfill the promise and prevent C.J. from stopping them.
—Patrick Depew