Okay, this is going to mess you up. This tune was written by Walter Vinson and Lonnie Chatmon of the Mississippi Sheiks. Sam Chatmon was Lonnie’s brother. He sometimes played with the Sheiks, but here’s a recording of him playing the song for Alan Lomax in 1978.
But since we were talking about Cream, it’s worth noting that they recorded this tune on Wheels of Fire, in 1968. It’s a little bit different.