Crossroads is a 1986 American coming-of-age musical drama film inspired by the legend of blues musician Robert Johnson. Starring Ralph Macchio, Joe Seneca and Jami Gertz, the film was written by John Fusco and directed by Walter Hill and features an original score featuring Ry Cooder and Steve Vai on the soundtrack's guitar, and harmonica by Sonny Terry. Vai also appears in the film as the devil's guitar player in the climactic guitar duel.
From Forgotten Guitar:
The Story Behind ‘Crossroads’ and Its Unsung Guitar Hero, Arlen Roth