Robert Alda (George Gershwin)
Joan Leslie (Julie Adams)
Alexis Smith (Christine Gilbert)
Charles Coburn (Max Dreyfus)
Julie Bishop (Lee Gershwin)
Oscar Levant (Himself)
Tom Patricola (Himself)
Jay Novello (Orchestra Leader)
Paul Whiteman & Orch. (Themselves)
Harry Seymour (Piano Player)
George Riley (Comic)
Frank Reicher (Actor/Actress)
Christian Rub (Swedish Janitor)
Virginia Sale (Cashier)
Ira Gershwin (Herbert Rudley)
Odette Myrtil (Mme. De Breteuil)
Oscar Lorraine (Ravel)
Ivan Lebedeff (Guest in Nightclub)
Eddie Cantor (Actor/Actress)
Yola D'Avril (Prima Donna)
Claire Du Brey (Receptionist)
William Gillespie (Porgy)
Rob Johnson (Sport)
Mark Stevens (Singer)
Al Jolson (Himself)
George White (Himself)
Hazel Scott (Herself)
Anne Brown (Bess)
Herbert Rudley (Ira Gershwin)
John B. Hughes (Commentator)
Mickey Roth (George Gershwin as a boy)
Darryl Hickman (Ira Gershwin as a Boy)
Charles Halton (Mr. Kast)
Andrew Tombes (Mr. Milton)
Gregory Golubeff (Mr. Katzman)
Walter Soderling (Mr. Muscatel)
Eddie Marr (Buddy De Sylva)
Theodore Von Eltz (Foley)
Bill Kennedy (Herbert Stone)
Robert Shayne (Christine's Escort)
Johnny Downs (Dancer)
Ernest Golm (Otto Kahn)
Martin Noble (Jascha Heifetz)
Will Wright (Rachmaninoff)
Albert Basserman (Prof. Frank)
Morris Carnovsky (Papa Gershwin)
Rosemary de Camp (Momma Gershwin)