Zachariah (1971)

Gunfights and electric guitars in the Old West? You bet! Zachariah gets a mail order gun, practices a little, and kills a man in the local saloon. He and his friend Matthew set out to become gunfighters, joining with the Crackers, a rock band who are also (pitifully inept) stage robbers. Having quickly outgrown that gang, Zachariah and Matthew set out to become bigtime gunslingers. Before long, they part company and a rivalry grows between them.