I found this article Secrecy surrounded Indianapolis Children's Choir's Super Bowl 2012 gig
They waited four or five more days before they got their answer: They'd be providing the choir to back up Kelly Clarkson when she sings the national anthem at Lucas Oil Stadium, right before the game...
Soon after that, Leck got another call from one of Clarkson's people. Leck was told the choir would do the "oohs" and "aahs" in the first half of the song, and, starting with "and the rockets' red glare," sing along to the second half. He was also told to write the music to accompany the song.
Leck and his accompanist cooked up a four-part treble arrangement and sent it to Clarkson's team. After a few tweaks to fit Clarkson's singing style, they were set to go -- once they learned the actual song, of course.
This will be make it or break it for Madonna not Kelly :P
The sales week is almost done. 9 more hours and the sales week will cease, Madonna has only a few hours to sell 170,000 copies to chart higher than kelly.
@kelly_clarkson Literally left my wardrobe at the hotel in Louisiana and my tour manager had to run back and get it. Now we're on the plane headed for the Super Bowl but that was a close one! I'm not sure if I could have pulled off spanx and heels while singing the anthem