Matthew Bellamy of Muse performs during the Outside Lands Music Festival 2011 on August 13, 2011 in San Francisco, California.

Regine Chassagne (L) and Win Butler of Arcade Fire perform at Day Three of the Outside Lands Music & Art Festival at Golden Gate Park on August 14, 2011 in San Francisco, California.

Win Butler of Arcade Fire performs with Mavis Staples at Day Three of the Outside Lands Music & Art Festival at Golden Gate Park on August 14, 2011 in San Francisco, California.

James Mercer of The Shins performs at the Outside Lands Music Festival on August 12, 2011 in San Francisco, California.

Dan Auerbach of The Black Keys performs on Day 2 of Outside Lands Music Festival at Golden Gate Park on August 13, 2011 in San Francisco, California.

Trey Anastasio of Phish performs at Day One of the Outside Lands Music & Art Festival at Golden Gate Park on August 12, 2011 in San Francisco, California.

Deadmau5 performs at the Twin Peaks Stage during the 2011 Outside Lands Music And Arts Festival at Golden Gate Park on August 14, 2011 in San Francisco, California.

Damian Kulash (L) and Andy Ross of OK GO perform at Day Two of the Outside Lands Music & Art Festival at Golden Gate Park on August 13, 2011 in San Francisco, California.

?uestlove of The Roots performs at Day Two of the Outside Lands Music & Art Festival at Golden Gate Park on August 13, 2011 in San Francisco, California.