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Mavis Staples performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

William McLaren of Delta Spirit performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Madeline Follin of Cults performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Brian Roberts of Ha Ha Tonka performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Kanye West performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Kanye West performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Theophilus London performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Nas and Damian 'Jr. Gong' Marley perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Nas and Damian 'Jr. Gong' Marley perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Brandi Carlile performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Matthew Vasquez of Delta Spirit performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Sara Bareilles performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Santigold performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Gary Clark Jr. performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Conor Oberst of Bright Eyes performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Bright Eyes perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Foster the People perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Mark Foster of Foster the People performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Big Boi performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

David Rawlings and Gillian Welch perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Regine Chassagne of Arcade Fire performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 18th, 2011 in Austin, Texas.

Empire of the Sun perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 18th, 2011 in Austin, Texas.

Luke Steele of Empire of the Sun performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 18th, 2011 in Austin, Texas.

Manu Chao performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 18th, 2011 in Austin, Texas.

Robin Pecknold of Fleet Foxes performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 18th, 2011 in Austin, Texas.

Stevie Wonder performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Alexandra Lawn and Cee-Lo Green perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Alison Krauss performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Court Yard Hounds perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Arcade Fire performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 18th, 2011 in Austin, Texas.

Fitz & the Tantrums perform during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Daniel Lanois' Black Dub performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Alexander Ebert performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Dallas Green of City and Colour performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Sameer Gadhia of Young the Giant performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Aloe Blaac performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 17th, 2011 in Austin, Texas.

Charles Bradley performs during the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.

Smiles abound at the 2011 Austin City Limits Music Festival at Zilker Park on September 16th, 2011 in Austin, Texas.