Lollapalooza celebrated its twentieth anniversary in Chicago over the weekend with headline performances by Eminem, Foo Fighters, Coldplay, and Muse. It was the support acts, however, that really excited us. So like he did at Bonnaroo, our tireless photog/artist wrangler Graeme Flegenheimer (with help from The Impossible Project) distributed Polaroid cameras and film to 23 bands -- 24 if you ...