I think Carl was playing that particular night with Mississippi Heat. He’s a great guitar player- and if I remember right, he took a lead vocal or 2 that was pretty awesome as well.
Check our his website at http://carlweathersby.org
Tim, the theater photographer at the time, suggested a photo while I was cleaning up the stage after the show. He told me later that he took dozens of pictures of Carl all night long, and this was the only time he was smiling for any photo!
What a great blues touch this guy has.