This is something I've experienced firsthand fairly recently - in fact, just a couple of hours ago. I mentioned in a thread I started in October that I had gotten a position teaching an extracurricular HS Jazz band at an area high school. For some reason, the jazz band has also been tasked with providing pep bands for the basketball games - basically, we can do some of the jazz band stuff, but we're also doing a lot of the marching band stuff. Since this isn't a "performance" per se, I play with the kids, usually supplementing the lead trumpet part, and I have found out just how taxing those charts can be. Granted, the purpose of pep band isn't to be musically excellent - it's to create energy and excitement, so we're pushing a bit of volume. All I know is that I've been a gigging player for a long time, and if it's taxing my chops, what is it doing to the HS kids? I was pretty spent by the end of halftime at the second game.