"Unforeseen personal problems" may well be the downfall of rock and roll. The latest victim is Def Leppard, who cancelled the 23 North American shows left on its tour with Cheap Trick. In a message on its website, the band said: "We know how truly blessed we are to have such committed fans. That's why we've agonized over this decision. Even if just a single concert, we don't take cancelling shows lightly, but unfortunately life’s commitments need to be the priority." As sorry as the guys are for the fans, they're probably a little more sorry for themselves. They were reportedly taking in $700,000 a show. [Mirror]