What am I talking about? I'll try and explain. I have an out of proportion muscle on my left arm, that I suspect is from holding my euphonium. As euph players know, we support most of the weight of the euph with our left arm leaving our right arm free to do all the stuff with valves (provided that you are not sitting crouched over with the euph sitting firmly in your lap!). Does anyone else suffer from this brass band related condition? Check by bending your left arm so that your left fist is nearly touching your left shoulder. Look down towards your elbow and you may see what I am talking about. Then do the same with your right arm and compare. I do hope I'm not the only one!!!! And another thing, (I hope someone else can vouch for this one too) brass players' lips. That muscle definition you get in your lips from years of hours of practising. One excellent cornet player (who shall remain nameless) who conducted our band at a competition a few years back strikes me as the best example I have seen of this.