Do I really need to? They keep things clean and because of it the games don't even carry parental guideline ratings. It's been plenty evident with their embarrassment with Janet Jackson's wardrobe malfunction, causing them to book 6 straight years of safe bands and artists way past their prime. In order: McCartney, The Rolling Stones, Prince, Tom Petty, Springsteen, and The Who. I mean, even before that they were picking safe bets and never really any modern rock musicians. And they likely never will because... "While halftime shows are a tradition during football games at all levels of competition, the Super Bowl halftime show represents a fundamental link to pop culture, which helps broaden the television audience and nationwide interest." ... meaning they get a performer who safely appeals to a wide audience, or at least they try. So they're going to go with something popular, or 'pop' that's also a safe family bet. By the very nature of the word, they are not going with something that's 'alternative'.