The 5,000 Fingers of Dr. T.

The 5,000 Fingers of Dr. T. (also known as Crazy Music in the 1958 reissue) is a 1953 American musical fantasy film about a boy who dreams himself into a fantasy world ruled by a diabolical piano teacher enslaving children to practice piano forever. It is the only non-documentary feature film written by Theodor Seuss Geisel (Dr. Seuss), who wrote the story, screenplay, and lyrics.