Jim James of My Morning Jacket

CHICAGO, IL - AUGUST 06: Jim James of My Morning Jacket performs on stage during Lollapalooza Festival 2011 at Grant Park on August 6, 2011 in Chicago, United States. (Photo by Daniel Boczarski)

Lollapalooza 2011

Jim James of My Morning Jacket

CHICAGO, IL - AUGUST 06: Jim James of My Morning Jacket performs on stage during Lollapalooza Festival 2011 at Grant Park on August 6, 2011 in Chicago, United States. (Photo by Daniel Boczarski/Redferns)

Eminem

Eminem Stage

Eminem Stage

Lollapalooza 2011

Lollapalooza 2011

Lollapalooza 2011

Lollapalooza 2011

Lollapalooza 2011

Lollapalooza 2011 in Chicago, IL

Lollapalooza 2011

Lollapalooza 2011

Lollapalooza 2011

Lollapalooza Festival 2011

CHICAGO, IL - AUGUST 06: Fans cheer during the performance of Black Lips during Lollapalooza Festival 2011 at Grant Park on August 6, 2011 in Chicago, United States. (Photo by Daniel Boczarski)

Lollapalooza 2011

CHICAGO, IL - AUGUST 5: Atmosphere at Lollapalooza 2011 Day One at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Lollapalooza 2011

CHICAGO, IL - AUGUST 5: Atmosphere at Lollapalooza 2011 Day One at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Lollapalooza 2011

CHICAGO, IL - AUGUST 5: Atmosphere at Lollapalooza 2011 Day One at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Lollapalooza 2011

CHICAGO, IL - AUGUST 5: Atmosphere at Lollapalooza 2011 Day One at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Lollapalooza 2011

CHICAGO, IL - AUGUST 5: Atmosphere as of The Naked and Famous perform at Lollapalooza 2011 Day One at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Lollapalooza 2011

CHICAGO, IL - AUGUST 5: Gregg Gillis of Girl Talk poses at Lollapalooza 2011 Day One at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

2011 Lollapalooza

CHICAGO, IL - AUGUST 05: People hop the fence to gain entrance to the 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Roger Kisby/Getty Images)

2011 Lollapalooza

CHICAGO, IL - AUGUST 05: A general view of atmosphere during the 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Roger Kisby/Getty Images)

2011 Lollapalooza

CHICAGO, IL - AUGUST 05: People hop the fence to gain entrance to the 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Roger Kisby/Getty Images)

Lollapalooza 2011

CHICAGO, IL - AUGUST 5: Atmosphere as Foster the People perform as part of Lollapalooza 2011 at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Pete Wentz and Bebe Rexha of Black Cards

CHICAGO, IL - AUGUST 05: Pete Wentz and Bebe Rexha of Black Cards backstage at 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Timothy Hiatt/Getty Images)

Kerli

CHICAGO, IL - AUGUST 05: Kerli performs during 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Timothy Hiatt/Getty Images)

Kerli

CHICAGO, IL - AUGUST 05: Kerli performs during 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Timothy Hiatt/Getty Images)

Billy Howerdel of A Perfect Circle

CHICAGO, IL - AUGUST 5: Billy Howerdel of A Perfect Circle performs as part of Lollapalooza 2011 at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Maynard James Keenan of A Perfect Circle

CHICAGO, IL - AUGUST 5: Maynard James Keenan of A Perfect Circle performs as part of Lollapalooza 2011 at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Conor Oberst of Bright Eyes

CHICAGO, IL - AUGUST 5: Conor Oberst of Bright Eyes performs as part of Lollapalooza 2011 at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)

Alice Glass of Crystal Castles

CHICAGO, IL - AUGUST 05: Alice Glass of Crystal Castles performs onstage during 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Roger Kisby/Getty Images)

Alice Glass of Crystal Castles

CHICAGO, IL - AUGUST 05: Alice Glass of Crystal Castles performs onstage during 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Roger Kisby/Getty Images)

Alice Glass of Crystal Castles

CHICAGO, IL - AUGUST 05: Alice Glass of Crystal Castles performs onstage during 2011 Lollapalooza at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Roger Kisby/Getty Images)

Special 20th Anniversary cake at the 2011 Lollapalooza

CHICAGO, IL - AUGUST 05: Special 20th Anniversary cake at the 2011 Lollapalooza press conference at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Timothy Hiatt/Getty Images)

Perry Farrell

CHICAGO, IL - AUGUST 05: Perry Farrell poses with the 20th anniversary cake at the 2011 Lollapalooza press conference at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Timothy Hiatt)

Perry Farrell

CHICAGO, IL - AUGUST 05: Perry Farrell attends the 2011 Lollapalooza press conference at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Timothy Hiatt/Getty Images)

Perry Farrell

CHICAGO, IL - AUGUST 05: Perry Farrell attends the 2011 Lollapalooza press conference at Grant Park on August 5, 2011 in Chicago, Illinois. (Photo by Timothy Hiatt/Getty Images)