Inside Out Man by Fred Strydom

Brilliant jazz pianist Bent lives from gig to gig in a city of dead ends. He is plagued by fragmented visions of the past, and has resigned himself to a life of quiet desolation. That is, until the night he meets wealthy and eccentric jazz fan Leonard Fry.

In the days that follow, Leonard makes Bent a devilish deal, proposing a bizarre experiment in which Bent will play a vital part. The deal provides an opportunity for Bent to start afresh, to question everything he knows, and for the two men to move beyond the one terrifying frontier from which neither of them can be sure they'll ever return: the borders of their own sanity.

Fred Strydom's novel The Inside-Out Man is a jazzy and surreal mind-bender of a book.