The only non-standard rendition of the Star Spangled Banner I've ever heard that I liked was Jimi Hendrix's. When I hear people sing it, I like "straight" versions.
The best ever performance at a sporting event, IMO, was by a young gal named Jewel at the 1998 Super Bowl. She sang it straight up, poured her heart in it, and demonstrated a spectacular voice. Plus, she showed off some really really nice ta-tas
culero (that last always helps anything
)