same reason they play Livin on a Prayer by Bon Jovi, Journey each week, and usually play 10-15 seconds into the play clock as we are trying to bark out signals.
I'm fine with the band but know wtf you are doing, be creative and entertain. And holy cow if you get stuck behind them in a bowl game or something you are screwed. They work hard but it's really not necessary to stand up and blow your tuba after every play.
Let us watch the game and let your team hear. Entertain at halfime and play after touchdowns. Otherwise, please sit down, relax and watch the game and stand up when appropriate.
2 yd gain on first down doesn't need a 20 second song