The lineup has been announced:

Foo Fighters, Robert Plant & Alison Krauss, Beck, Manu Chao, John Fogerty, David Byrne, The Raconteurs, The Mars Volta, Gnarls Barkley, Conor Oberst and the Mystic Valley Band, N.E.R.D, Erykah Badu, Robert Earl Keen, Patty Griffin, Tegan & Sara, Iron & Wine, G. Love & Special Sauce, Neko Case, Band of Horses, The Swell Season, Silversun Pickups, Gogol Bordello, Gillian Welch, Eli Young Band, The Black Keys, Against Me!, Jakob Dylan and the Gold Mountain Rebels, Okkervil River, Galactic, Kevin Fowler, Sharon Jones and the Dap Kings, Hot Chip, Vampire Weekend, Slightly Stoopid, Duffy, Alejandro Escovedo, Roky Erickson, Yonder Mountain String Band, Spiritualized, Flyleaf, Drive-By Truckers, Ingrid Michaelson, Stars, José Gonzales, CSS, Del the Funky Homosapien, Man Man, Jamie Lidell, MGMT, What Made Milwaukee Famous, Jenny Lewis, M. Ward, Asleep at the Wheel, Mason Jennings, Heartless Bastards, Antibalas, The Nachito Herrera All-Stars, Shooter Jennings, Xavier Rudd, Yeasayer, Octopus Project, Joe Bonamassa, The Kills, White Denim, Louis XIV, Delta Spirit, Mates of State, Nicole Atkins & The Sea, Electric Touch, Black Joe Lewis & the Honey Bears, Back Door Slam, Tristan Prettyman, The Strange Boys, Ryan Bingham, Scott Biram, Freddy Jones, Colour Revolt, Five Times August, Langhorne Slim, Sybris, Eli "Paper Boy" Reed and the True Loves, Bavu Blakes & the Extra Plairs, AA Bondy, Christopher Denny, Mike Farris, The Lee Boys, South Austin Jug Band, American Bang, Bobby Bare, Jr., Massacoustics, Belleville Outfit, We Go to 11, Band of Heathens, City and Colour, Sunny Sweeney, Elizabeth Wills, Bonnie Bishop, Ben Solee, Ben Cylus, The Concert Supremes, River City Christionettes, Shields of Faith, The Jones Family Singers, Nakia and his Southern Cousins, Brotherly Luv, The Hensley Ensemble, School of Rock, Jambo, Q Brothers, Buck Howdy with BB, Uncle Rock, Big Don, Mr. Ray, The Jimmies