Stars including Eminem, Rihanna, Usher, Soundgarden, JANE'S ADDICTION And N.E.R.D. took to the stage at the Staples Center in Los Angeles on Monday night (14Jun10) to help videogames maker Activision launch its new products. The concert featured sets from the musicians interspersed with information on games such as Guitar Hero, Call of Duty: Black Ops and DJ Hero 2.