I’m sorry, but aren’t all the performances done to prerecorded music? I call bullshi$ on this one:

CHRISTINA AGUILERA’s stunning Grammy performance didn’t come close to matching the fireworks at an earlier rehearsal when she suddenly exploded at the orchestra - and flung her microphone on the floor! "That’s NOT the way I want you to play it," screamed the sizzling hottie. "Why the hell can’t you get it RIGHT?" She stormed out, followed by her angry entourage - but was ...