Incidentally, I heard a version a while back played with a bluesy feel which I thought was by John Cougar Mellencamp. It's how I play it, and it's in a minor key (chords are Am Em G Am, or some similar equivalent). I've checked JCM's back catalogue, and I can't find it - anyone know if I'm barking up the wrong tree here? Is this actually the Shirley & Lee version, or the PP&M version?

Grab.