Alright, I have played trumpet for 7 years now. Now I am in high school and I don't want to use my professional cornet on the field. My band director said I should play Mellophone(sp?), but I really want to play baritone. My director said I could lose my embouchure if I played baritone. I was looking around the net and found an attachment that makes a trombone mouthpiece work in a baritone, so I was wondering what is the closest size trombone mouthpiece to a trumpet mouthpiece? I would say probably 7C since I'd just be starting baritone and I'd imagine that the amount of air that needs to be put through is different. Could anybody please help me on this problem? Thanks!