Yeah, I’m watching the Super Bowl right now (just about everything is entertaining in HD). I don’t wanna start a conspiracy theory, but… it sounded to me like Billy Joel’s voice (during the Star Spangled Banner) was being aided by some kind of electronic equipment? Not the whole song, mind you – he missed a noteat the beginning of the anthem. From that point forward, he sounded synthisized in certain parts. I’m sure it wasn’t a vocoder, but I really think his voice was enhanced as a contingency. I hope he’s okay; I love Billy Joel. I think he was auto-tuned:

Auto-Tune is a proprietary audio processor for correcting pitch in vocal and instrumental performances. It is used to disguise inaccuracies and mistakes and, due to its increasing use in modern music, has allowed many artists to produce more precisely tuned recordings. Its manufacturer, Antares, offers the processor in several plug-in formats as well as in a rack mount hardware solution.

Billy Joel at the Super Bowl