EminemWhen the lineup for Bonnaroo 2011 was released back in February, some fans thought it skewed a little too far left of the festival's jammy roots. Eminem -- whose name usually dominates mainstream and rap album charts -- didn't seem like a natural fit for the festival's big tenth anniversary but on Saturday night, June 11, the Detroit native proved otherwise.

On the brink of releasing a new album -- a nine-track joint EP with fellow rapper Royce da 5' 9" -- under the name Bad Meets Evil, Eminem's Bonnaroo performance was convenient to start. He tore onto the stage in a t-shirt plugging the release and invited Royce Nickel and Nine out for a few cuts off the album -- 'Lighters' and lead single 'Fast Lane.' "I knew it was a real big festival," Royce told AOL backstage, about rolling up to the middle of nowhere. "All I'm hearing is 50,00 people, 80,000 people, 100,000 people -- I don't know what the hell I'm about to go see."