Here's the list of people who'll be at it:
Eminem, Muse, Arcade Fire, Jay-Z, Black Eyed Peas, Kasabian, The Prodigy, Fatboy Slim, Florence and the Machine, Paolo Nutini, Faithless, Editors, Bell X1, Stereophonics, Wolfmother, David Guetta, Dizzee Rascal, Doves, Julian Casablancas, The Stranglers, Earth, Wind & Fire, Echo & the Bunnymen, John Mayer, The Cribs, Hot Chip, Calvin Harris, Republic of Loose, Newton Faulkner, The Temper Trap, Empire of the Sun, Goldfrapp, Gossip, La Roux, Rise Against, Ocean Colour Scene, The Coral, The Coronas, The Courteeners, Broken Social Scene, Vampire Weekend, Mumford and Sons, Ellie Goulding, Laura Marling, Two Door Cinema Club, Scouting for Girls, The Middle East, Armand Van Helden, Steve Angello, Simian Mobile Disco, Erol Alkan, Steve Aoki, A-Trak and Aeroplane are among the acts set to perform.