Correct me if I'm wrong, but doesn't lip structure have most of everthing to do with comfortablility and mouthpiece size?
I am not totally convinced of that, Mr. Demon. When someone with lips like Louis Armstrong can play a trumpet m'pce brilliantly?

Just sayin'.
In my own experience I have doubled quite effectively on tenor trombone (6.5 AL originally) and orchestral-sized tubas since I was in the 7th grade. I didn't know that I couldn't do this, so I just went ahead and did it. Since then I have put on about over 100 lbs of flesh and bone...I'm not fat, but I am certainly bigger in every dimension. I still feel very comfortable on a 6.5-ish rim, but as a professional lower brass doubler I also play 11C-ish m'pces, 12Cs,3, 4 and 5-ish rims and large bass trombone and…







