How much rock is too much rock? This triple bill just might answer this question: Def Leppard, Cheap Trick and Poison will all be playing together on Monday, July 20, at the Verizon Wireless Amphitheater. All three bands have been playing shed-tour-lineup Tetris over the past few years, but this configuration makes perfect sense. Reserved seats are $45, $65, $91 and $131, lawn tickets are $35.50, and all go on sale this Saturday, March 7. What's that, Bret Michaels? It's a bit early in the morning to ask that, don't you think?