So, when I was in the army, we were stationed once near where a band practiced.
Picture, trying to settle in to discuss supply lines, and then hearing, sadly, floating up from the alley someone trying to learn one of those large horns.
That was the same post where we had a tiny moogle kid learning how to fly, and the entire department made her little hang-gliders out of our stray paper.
I tried to find something about the right shape, and ended up instead finding a gentleman on the internet who reviews poor quality trumpets and the like. It's . . . impressive.