Press conference musical performances are always a bit mortifying for all involved. The stage sucks, the audience isn't there for music, and no one's been drinking. (Well, almost no one. These are journalists, after all.)
A night of live music from artists like Usher, Jane's Addiction, Soundgarden, Maynard James Keenan, Eminem, and more turns slightly awkward as Activision's lavish E3 2010 production confuses as much as it astounds.