I have never sat down and learned it note for note, but I've been sitting around picking at it, and if I'm hearing it right in my head, it's in Dm, be careful with the bends, their a little subtle, and keep hacking at it, perseverance pays, I've got some old Roy on tape around here somewhere and I think you may have stirred me to dig it out, have you heard his version of "Sweet Dreams"?,