The 2011 Pitchfork Music Festival is now official, and will take place on Friday, July 15 through Sunday, July 17 in Chicago’s Union Park.

The independently-run Pitchfork Music Festival has invited bands from Vampire Weekend, Fleet Foxes, Band of Horses, Bon Iver, Animal Collective, Girl Talk, Sleigh Bells, Grizzly Bear, Dirty Projectors, Beach House, to Dan Deacon, Deerhunter, St. Vincent, Best Coast, Titus Andronicus, and more to take their stages. It’s been one of the top festivals to match new, just burgeoning performers with famous, well-established acts from The Flaming Lips, Public Enemy, Sonic Youth to Modest Mouse, LCD Soundsystem, The Jesus Lizard and Yoko Ono.

Tickets for the 2011 Pitchfork Music Festival will go on sale as early as Friday, March 4, with single-day tickets for $45 and three-day passes for $110, making this three-day event one of the most reasonably priced of all festivals in the U.S. Three-day passes are known to sell out in under a week, so reserve yours as soon as you can, even before you find out who’s headlining. Tickets will be available on the festival website.

Photo of Robyn at Pitchfork 2010 by Dennis McLennand