Last year featured a Slint reunion, Daydream Nation retelling, coke rap, and awesome attire. What does P4K having in store for Union Park (and its surrounds) this year? We don't know everything yet -- there will reportedly be 40 acts in all -- but they have announced a few of the crowd faves and biggies. Though maybe none as sonically big as last year's ear-slayers, Mastodon.

[Photo from Mastodon @ Pitchfork Music Festival 2007]