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.
The Mephisto Waltz
An old, dying satanist arranges to transfer his soul into the body of a young concert pianist.