A mysterious thief has stolen the prosperous Happy Valley's most prized possession: the musical Singing Harp. Can Mickey, Donald, and Goofy find the answer in the irritable Willie the Giant's magnificent castle up in the blue sky?
Not streaming on a subscription service in the US right now.
Starring Walt Disney, Clarence Nash, Pinto Colvig, Sterling Holloway, Paul Frees, Billy Gilbert, Anita Gordon