Demi Lovato Sings The National Anthem At The Big Game

For the second week in a row Demi Lovato has slayed a nationally televised performance.
Last Sunday she debuted a new song at the Grammys.  This Sunday she performed the National Anthem at the Super Bowl in Miami.  She sounded great, looked comfortable and at ease.
What did you think of the performance? Who would you say has sung the national anthem at the Super Bowl the best?