After their annual free concert at Chicago's Dearborn Settlement, Benny Goodman and his band are packing up to go to their next engagement when a kid steals Goodman's clarinet. Goodman and Popsie pursue him to a tenement flat where he has led them to hear his brother play the trombone. Shenanigans ensue following Goodman's offering the brother a job with the band.
| Actor | Role |
|---|---|
 Benny GoodmanBenny Goodman | Benny Goodman |
 Linda DarnellTrudy Wilson | Trudy Wilson |
 Jack OakiePopsy | Popsy |
 Lynn BariPat Stirling | Pat Stirling |
 James CardwellJohnny Birch | Johnny Birch |
 Allyn JoslynLester Barnes | Lester Barnes |
| JJohn CampbellDixie Zang | Dixie Zang |
| RRoy BensonSkeets McCormick | Skeets McCormick |
 Dickie MooreMilitary Cadet General 'Mogie' Cramichael | Military Cadet General 'Mogie' Cramichael |
 Terry MooreSnub-Nosed Girl on Dance Floor (uncredited) | Snub-Nosed Girl on Dance Floor (uncredited) |