Tull for one. No voice, no Barre, I'm done. Buddy Guy is the one that came to mind. Saw him every time he came to town. Blew me away the first time I saw him in the '80's. Walked around the club and out the door while playing, played with his teeth, all the tricks. Then I saw him in the same club a couple more times over the next decade and got pretty much the exact same show. I waited about five years and saw him at a different, larger venue and . . . got the exact same show minus the walk outside. As good a show as it is, four times was enough.