Crossroads (1986)

Eugene is an extraordinary talent in classic guitar, but he dreams of being a famous blues guitarist, so he investigates to find a storied lost song. He asks legendary blues musician Willie Brown to help him, but Willie demands to be sprung from the old-people's prison first and to really learn the blues on the way to its origin: the Mississippi Delta. Eugene doesn't know yet about Willie's deal with the devil, which he now wishes to revoke.