The excitement isn’t the only thing building in Chicago! Here are some fresh pics from Grant Park where Lollapalooza 2009 is taking shape. Check out Perry’s, the epicenter of all things DJ, dance, and electronica for the festival, with an awesome stage to match. Expanded and improved since its debut last year, we’ve got a ridiculous lineup planned that includes Bassnectar, MSTRKRFT, Simian Mobile Disco, KiD CuDi and A-Trak, among others. More images after the jump!