The Who, and the Super Bowl's Evolving Halftime Show

Michael Jackson, above, during his show at halftime in 1993. In 2004, his sister Janet's "wardrobe malfunction" caused a furor.  Once upon a time, a Super Bowl halftime show meant Carol Channing, college marching bands, Up With People and salutes to Louis Armstrong. These days, headliners like the Rolling Stones and Paul McCartney happily line up to play a 12-minute set. This year, the Who