Because the talent of the performer is what should be on display, not the creative recording done in someones basement. It may be brilliant, but it's not live and quite frankly it's what a lot of us miss from the old days. Hell, it was early so they may have changed it, but there was what felt like three minutes that one corps parked the hornline out of sight and did whatever it is that went on. Honestly if I was a member and I parked out of sight for that length of time, I would wonder why I joined. I wanted to play my horn as much as I could because that's what I was best at. I can understand staging and props (not a fan) but for music people the acoustic production of sound is what we are impressed with, not some sample played on time. Overtones......I want overtones.