You probably think this is an Eric Clapton song. And he did cover it, along with a lot of other blues songs by African-American artists. Legend has it that Robert Johnson sold his soul to the devil to become a great guitar player. Said legend has been the fodder of fiction for ages, including an episode of Supernatural and one of my Cassie Zukav stories. Anyhow, here’s his most famous song (due, it’s true, mostly to Clapton).