Welllll... one of my big concert disappointments was having a Who concert cancelled in 1970. The deadheads that didn't have tickets had started a ruckus outside the Yale Bowl the week before, that was a great show though. So I never did get to see them.
Now my dissappointment is even greater because that was pretty pathetic, they tightened up a little toward the end...but still I wouldn't pay to see that now.
If they want an old rock geezer how about an American act that's still rocking like John Fogarty?