The Avett Brothers: We don't know what they'll play, but we can be sure the Avetts and company will bring us cello sawing, foot stomping and Seth Avett's infamous scream. At that point, does the set list really matter?
Zedd: If he were officially a ruler of the electro house and/or dubstep genre, we could call him Lord Zedd and make him fight the Power Rangers. But he's not, so instead you'll have to go watch his set and dream of what could have been.
Spoon: Talk about being in it for the long-haul: Spoon's first EP was released in 1994, but it took this band over 10 years and two failed major label deals before they found a mainstream audience. After that, they took off. Was the wait worth it? Go listen and decide for yourself.
Chromeo: Dave 1 and P-Thugg and the sexiest keyboard stands you've ever seen are coming to make you dance. Wanna make sure you've got the chant right beforehand? Think back to the guards of The Wizard of Oz and repeat after us "CHROMEO-OH-OOOOOH-OH!"