If I were going these would be my picks.
Friday:
The Black Keys
Mazzy Star
Afrojack
Explosions in the Sky
M83
Saturday:
Radiohead
Bon Iver - Don't understand the hype
The Shins
David Guetta
Noel Gallagher's High Flying Bird
Kaskade
Miike Snow
Feist
Martin Solveig
Manchester Orchestra
AWOLNATION
Kaiser Chiefs
Tune-Yards
Grace Potter and the Nocturnals
Grouplove
Dragonette
Sunday:
Dr. Dre and Snoop Dogg
Justice
Florence and the Machine
Avicii
La Roux
Girl Talk
Modeselektor
Santigold
Lissie
Metronomy