I've been a cornet player for 12 years, but due to my atrocious ability to improve my high register (believe me, I HAVE tried) I can't hold lead positions in bands. It's frustrating because I know my skills, bar high notes, are up there.. as they should be after such a long time, but I just can't seem to get my high register to improve. So I was wondering whether moving to baritone might help. I don't want anything to big, so thought that might be a good compromise. Would it be easier for me to improve my register with a bigger mouthpiece? When I played tuba, I could get three octaves, and on my cornet I struggle with even two, with the top notes always sounding squeezed and forced. Does anyone think this is a good idea? And how long do you think it will take for me to get my lip comfortable with the new mouthpiece size?