Mademoiselle S'Amuse (Mademoiselle Has Fun) is purely and simply a vehicle for popular bandleader Ray Ventura. What plot there is concerns a jazz-happy damsel (Giselle Pascal) who has her wealthy daddy (Randall) wrapped around her little finger. Our spoiled heroine demands that her father hire Ventura and his band to play for her day-and-night, nonstop. She gets her wish, resulting in reams of swing tunes and ballads before the girl realizes that her selfishness is depriving others of the talented Mr. Ventura. One critic described this 97-minute songfest as a "long short subject."