Wow, this sort of rules:
Saturday October 16, 2004: Beastie Boys, Green Day, The Pixies
Paul Van Dyk, The Killers, Gomez, Cypress Hill, Black Rebel Motorcycle Club, Polyphonic Spree, Sonic Youth, Snow Patrol, New Found Glory, Phantom Planet, Metric, The Thrills, KillRadio, Gooding, Mix Master Mike
Sunday October 17, 2004: Kid Rock, Velvet Revolver, A Tribe Called Quest, Alter Bridge, De La Soul Cowboy Mouth, Shinedown, Supagroup, Wylde Bunch, Gogol Bordello, Ghost, Particle, Sugarcult, LTJ Bukem, MC Conad, Mauro Picotto, Ferry Corsten
The festival happens in New Orleans. Official site here.