The 1978 musical 'The Wiz' is an adaptation of L. Frank Baum's classic novel, The Wonderful Wizard of Oz. It was first performed on Broadway in 1975 and was later adapted into a film in 1978. The musical follows the same story as the novel, with Dorothy, the Scarecrow, the Tin Man, and the Cowardly Lion all journeying to the Emerald City to meet the Wiz. The Wiz is a powerful wizard who can help them get back home.