So I started playing trumpet in 4th grade. I am now in 12th grade. Just recently my school got a new band teacher, who is a fantastic trumpet player, and he watched me play and told me I have a "round embouchure". Ever since he told me this, I have practiced everyday trying to play high and all I can get to is an A. I want to go to at least a high C because I'm working on a solo that requires it. Anyway, if it helps, here's a little more info: I play on a 7C mouthpiece (should I try another one?) My trumpet is a Conn 22B (do I need a better horn?) Any advice would be great. Is it my mouthpiece? My horn? My round embouchure?