When Tubby the Tuba sets out to find a melody all of his own, his journey results in this enchanting and exciting musical tale. Tubby joins the circus and striving to be part of an orchestra, he travels to the Singing City where along the way he encounters many wonderful characters.
| Actor | Role |
|---|---|
| PPaul TrippNarrator (voice) | Narrator (voice) |
 Dick Van DykeTubby the Tuba (voice) | Tubby the Tuba (voice) |
 Pearl BaileyMrs. Elephant (voice) | Mrs. Elephant (voice) |
 Jack GilfordThe Herald (voice) | The Herald (voice) |
 Jane PowellCeleste (voice) | Celeste (voice) |
 Cyril RitchardThe Frog (voice) | The Frog (voice) |
| RRuth EndersThe Haughty Violin (voice) | The Haughty Violin (voice) |
 David WaynePee-Wee the Piccolo (voice) | Pee-Wee the Piccolo (voice) |
 Ray MiddletonThe Great Pepperino (voice) | The Great Pepperino (voice) |
 Hermione GingoldMs. Squeek (voice) | Ms. Squeek (voice) |