Activision kicked off their E3 Expo at the Staples Center last night with musical performances by DJ deadmau5, DJ David Guetta, Pharrell Williams of N.E.R.D., Usher, Rihanna, and Eminem. Activision combined some musical performances with demonstrations of their latest video game titles, Call of Duty: Black Ops, Guitar Hero: Warriors of Rock and DJ Hero 2. The Expo celebrates the latest computer and video games and goes on until June 17.
