Irving Rapper Director Robert Alda George Gershwin Actor Joan Leslie Julie Adams Actor Alexis Smith Christine Gilbert Actor Oscar Levant Self Charles Coburn Max Dreyfus Actor Julie Bishop Lee Gershwin Actor Albert Basserman Professor Franck Actor Morris Carnovsky Morris Gershwin Actor Herbert Rudley Ira Gershwin Actor Rosemary DeCamp Rose Gershwin Actor Paul Whiteman Self Hazel Scott Self Howard Koch Screenwriter Elliot Paul Screenwriter Jesse L. Lasky Producer Sol Polito Cinematographer Folmar Blangsted Film Editing Anton Grot Art Director John Hughes Art Director Fred M. MacLean Set Decoration Milo Anderson Costume Design Henry Rackin Casting