Eminem is EXTREMELY dissapointing live. He uses a backing track for most of his vocals and is pretty static in his performance. Take a look at his set from VooDoo Fest a couple years back, he leaves A LOT to be desired. Coachella has been trying to book Outkast for last 5 or 6 years, it's not gonna happen. Andre 3000 doesn't perform live under the Outkast moniker anymore.
it could be big boi and andre 3k, instead of going under outkast