Cast from Mr. Music

Bing Crosby

Paul Merrick

Nancy Olson

Katherine Holbrook

Charles Coburn

Alex Conway

Ruth Hussey

Lorna Marvis

Robert Stack

Jeff Blake

Tom Ewell

'Cupcake' Haggerty

Ida Moore

Aunt Amy

Charles Kemper

Mr. Danforth

Richard Haydn

Jerome Thisbee

Donald Woods

Tippy Carpenter

Marge Champion

Marge Champion

Gower Champion

Gower Champion

Groucho Marx

Groucho Marx

Dorothy Kirsten

Dorothy Kirsten

Peggy Lee

Peggy Lee

Irving Bacon

Benson - Jewelry Clerk (uncredited)

Bess Flowers

Party Guest (uncredited)

Leon Tyler

Bookish Student (uncredited)

Norma Zimmer

Singer (uncredited)