Acting
Kenneth Lorin Darby (May 13, 1909 – January 24, 1992) was an American composer, vocal arranger, lyricist, and conductor. His film scores were recognized by the awarding of three Academy Awards and one Grammy Award. He provided vocals for the Munchkinland mayor in The Wizard of Oz (1939), who was portrayed in the film by Charlie Becker. Darby is also notable as the author of The Brownstone House of Nero Wolfe (1983), a biography of the home of Rex Stout's fictional detective.
Ken Darby's choral group, The Ken Darby Singers, sang backup for Bing Crosby on the original 1942 Decca Records studio …

Walt Disney's Halloween Hilarities
as Jack-o'lantern (voice)

Trick or Treat
as Jack-O'lantern (uncredited)

The Brave Engineer
as Himself

Fun and Fancy Free
as The Bull (voice) (uncredited)

Donald's Dilemma
as Donald Duck's Singing (voice) (uncredited)

Make Mine Music
as The King's Men / Choral Director (Ken Darby Chorus) (singing voice) (uncredited)

Margie
as Off-Screen Singer (voice) (uncredited)

The Martins and the Coys
as The King's Men

The Kansan
as Member - The King's Men

For Me and My Gal
as Member - The King's Men (uncredited)