Out National Anthem is less that musically stellar as far as I am concerned, and it really takes someone "talented" to do a nice job of it. I am frequently disappointed by singers who try to put their own "twist" to the song and ruin it completely, in my opinion.
A while back I posted the link to Jerry Garcia and the Grateful Dead singing at a Giants baseball game in San Francisco because I thought it was just classy. Here is another version that equals some of the best I've ever heard.
Cactus Cuties