The Mephisto Waltz (1971)

Jacqueline Bisset, Alan Alda, Antoinette Bower, William Windom

Myles Clarkson, a classical piano player on the rise, befriends Duncan Mowbray Ely, a famous player himself who is at death's door. Unknown to Clarkson, Ely is a Satanist, who arranges to have their souls switch places at his death, so that he can be young again and continue to play piano. ?Humberto