As usual with big fests, the headliners are disappointing. But who cares? The undercard is always where the action is. Here’s who’s playing, with MP3s where I could find them.

See you in Chicago, August 3-5, 2012.

Afghan Whigs
Alabama Shakes (MP3: I Found You)
Aloe Blacc (MP3: You Make Me Smile)
Amadou & Mariam
Ambassadors (Soundcloud: Unconsolable)
Anamanaguchi
Animal Kingdom (MP3: Tin Man via Magnet)
At The Drive-In
Avicii
Band of Skulls (MP3: Sweet Sour)
Bassnectar
Bear in Heaven (MP3: Reflection of You)
Big Gigantic
Big Pink (MP3: Give It Up)
Black Angels (MP3: Telephone)
Black Keys
Black Sabbath
Blind Pilot (MP3: Keep You Right via Magnet)
Bloc Party
Bombay Bicycle Club
Bowerbirds (MP3: In the Yard)
Calvin Harris (MP3: Acceptable in the ’80s)
Chairlift (MP3: Sidewalk Safari)
Chancellor Warhol
Childish Gambino (Soundcloud: The Longest Text Message)
Dawes (MP3: Love Is All I Am)
Delta Spirit (MP3: People C’mon)
Dev
Devil Makes Three
Die Antwoord
DJ Mel
DJ Nihal
DJ Zebo
Doomtree (MP3: Grand Experiment via Magnet)
Dr. Dog (MP3: Old Days)
Dry The River
Dum Dum Girls (MP3: He Gets Me High)
Dunwells
Empires
FIDLAR
First Aid Kit (MP3: Hard Believer)
Florence + The Machine (MP3: Not Calling You a Liar)
Frank Ocean
Franz Ferdinand (MP3: What She Came For via Magnet)
FUN. (MP3: At Least I’m Not As Sad)
Gary Clark Jr.
Gaslight Anthem
GIVERS (MP3: Up Up Up)
Growlers
Haley Reinhart
Head & The Heart (MP3: Lost in My Mind)
Helena
Hey Rosetta! (MP3: Yer Spring)
Imaginary Cities (MP3: Hummingbird)
J. Cole
Jack White
JC Brooks & The Uptown Sound (MP3: I Am Trying to Break Your Heart)
JEFF the Brotherhood (MP3: Bone Jam)
Jezabels (MP3: Mace Spray)
JJ Grey & Mofro
Justice (MP3: D.A.N.C.E.)
Karmin
Kaskade
Kevin Devine (MP3: Brother’s Blood)
Kid Color
Knife Party
Kopecky Family Band (MP3: God and Me)
Laura Warshauer
Little Dragon (MP3: Blinking Pigs)
Los Jaivas
LP
M83 (MP3: We Own the Sky)
Macklemore & Ryan Lewis
Madeon
Metric (MP3: Monster Hospital)
Michael Kiwanuka
Miike Snow (MP3: Animal)
Milo Greene
Mona
Moon Taxi
Nadastrom
Neon Indian (MP3: Terminally Chill)
NERO
O Rappa
Oberhofer (MP3: I Could Go)
Of Monsters and Men (MP3: Little Talks via Magnet)
Orchard Lounge
Overdoz
Paper Diamond
Passion Pit (MP3: Sleepyhead)
Polica
Porter Robinson
Red Hot Chili Peppers
Red Oblivion
SALVA (MP3: Wake Ups via Magnet)
Santigold
SBTRKT (MP3: Wildfire)
Sharon Van Etten (MP3: Serpents)
Sheepdogs
Shins (MP3: Australia)
Sigur Ros (MP3: Gobbledigook)
Skream & Benga
Star Slinger (MP3: Mornin)
Sub Focus
Tallest Man on Earth (MP3: Like the Wheel)
Tame Impala (MP3: Runaway)
Temper Trap (MP3: Temper Trap via Magnet)
thenewno2
Toro Y Moi (MP3: Still Sound)
Totally Enormous Extinct Dinosaurs
Trampled By Turtles
tUnE-yArDs (MP3: Bizness)
Twin Shadow (MP3: Castles in the Snow)
Wale
Walk Off The Earth
Walkmen (MP3: Stranded)
War on Drugs (MP3: Baby Missiles)
Washed Out (MP3: Amor Fati)
Wax
Weeknd (Soundcloud: Initiation)
White Panda
White Rabbits (MP3: Heavy Metal)
Yellow Ostrich (MP3: Whale)
Yuna (MP3: Decorate via Magnet)
Zedd
Zeds Dead