Soviet Russia. The 1920s. The NEP. Odessa Music College student Kostya Ivanov is attracted by a new direction in music - by jazz. For this hobby he, a Komsomolets, is kicked out of college, offering a choice - study or his favorite music. Konstantin chooses jazz. Kostya wants to create a jazz band. Seeing an ad two other musicians visit him - Stephan and Zhora. Stephan plays the banjo, and Zhora - drums. Konstantin causes theie interest in jazz and rehearsals of a newfound jazz band begin.