From humble beginnings of the Grambling State marching band in the inaugural game of 1967 to Al Hirt to Louis Armstrong to the influx of the musical megastar marquee attraction- kick started in 1993 by Michael Jackson- halftime of America's big game has proven a forum for expensive productions, elaborate crowd involvement, detailed choreography and glitzy effects. Here are some great tunes from the greatest names to grace the stage of a part of the Super Bowl that's nearly as closely watched by its TV audience as the game itself.