Check out this footage of a marching band from Michigan playing the music from South Park: Bigger, Longer, and Uncut. It looks like it's from a show that features music from Family Guy and the Simpsons as well, which must be a hell of a field show. Back in my marching band days, we did some fun field shows like that as well. Unfortunately, we never got to play "What Would Brian Boitano Do?".
Anyway, the songs featured in the video are "What Would Brian Boitano Do?", "Blame Canada", and "La Resistance/Medley". Too bad they didn't go for the whole musical, because it's really great.