Get ready to sweat it out in the Live Music Capital of the World! This year’s lineup includes Tom Petty & the Heartbreakers, Gnarls Barkley, the Flaming Lips, Ben Harper & the Innocent Criminals, Massive Attack, John Mayer, the Raconteurs, Ray LaMontagne, Matisyahu, the Shins, Iron & Wine, Kasey Chambers, Van Morrison, and Willie Nelson. The Festival runs September 15 through September 17.