Felix Bressart
Professor Gerkikoff
O. Z. Whitehead
Professor Oddly
Sidney Blackmer
Adams
Virginia Mayo
Honey Swanson
Ludwig Stössel
Professor Traumer
Esther Dale
Miss Bragg
Hugh Herbert
Professor Twingle
Danny Kaye
Professor Hobart Frisbee
Steve Cochran
Tony Crow
Peter Virgo
Louis
Louis Armstrong
Louis Armstrong
Benny Goodman
Professor Magenbruch
Ben Welden
Monte
J. Edward Bromberg
Dr. Elfini
Howland Chamberlain
Mr. Setter
Paul Langton
Joe
Mary Field
Miss Totten
Laurindo Almeida
Laurindo Almeida
Sue George
Cigarette Girl (uncredited)
Tommy Dorsey
Tommy Dorsey
Lionel Hampton
Lionel Hampton
Mel Powell
Mel Powell
Charlie Barnet
Charlie Barnet
Louie Bellson
Drums
Milicent Patrick
Woman at Dorsey Club (uncredited)