Cut and Pasted from Earthlink news

Her record company, Geffen Records, said there was a computer glitch. Instead
of some pretaped electronic percussion, the recording of "Pieces of Me"
started
mistakenly performing, the record company said in a statement.

But it sounded suspiciously like a guide vocal that's a common - although
almost always unspoken - concert aid. Either the singer "lip synchs" by
mouthing words to a backing tape or has a live microphone and sings along to
the tape, making the voice sound more powerful than it is. 

Such vocal tricks have been used before on the show, making "Saturday Night
Live" not entirely live, said a show insider who spoke on condition of
anonymity. 


Billy G. Spradlin
http://listen.to/jangleradio