This came directly from her mouth. She said that she found out yesturday, and that she was singing BOY.
She was performing at a special show for the NAMM. She performed at it last year too. Its exclusive and only about 100 people are allowed in. Others like the Goo Goo Dolls performed there as well.
I think 'BOY' is the perfect song to sing at the Grammys so we can hear those vocals! I think she should perform most of song w/ just the piano & then the orchestra/band come in at the bridge. Something like Evanescence's 'My Immortal'...to me that would be