Photos: Pitchfork Music Festival must-see acts

It's not often you get to see a disco pioneer, a rising West Coast hip-hop giant and a guitar-playing art-rock innovator share a weekend with 60,000 of their closest friends, but that's the way the Pitchfork Music Festival is shaping up in Union Park. Besides Giorgio Moroder, Kendrick Lamar and St. Vincent, there will be 40 other artists and bands on three stages, ranging from relatively obscure up-and-comers to reunited icons from previous eras (take a bow, showgaze-era profits Slowdive). It all starts at 3:30 p.m. Friday, and won't end until Kendrick Lamar brings things to a close sometime around 10 p.m. Sunday. - Greg Kot