I had a director back in high school that was a huge DCI fan boy and we did warm ups like this. He demanded a higher standard from us and boy did we produce. I had more fun in marching band in high school than I did in college.
Victor Averos taught me how to play in Elementary School & we marched together in Spirit of Newark 02-03 , amazing how he marched 1 year in BD , went undefeated and got himself a ring !!! Fun fact : we both used a 6A4a back in school to help us hit them high notes lol
You know as soon as they were given the instruction to put their horns down every single one of them were glaring at the trumpet section because of that one trumpet holding out that last note to long xD