And I disagree with this... while I do agree, matching your face with the right mouthpiece is essential, once the interface between anatomy of the face and use of the same mouthpiece is established... this is no longer a variable when the mouthpiece is placed on another horn. That face mouthpiece interface is the same... unless of course you are tightening up because you have psyched yourself out to fail. I can play the same range whether it's on the Martin Committee, the Olds Super, the Olds Recording, the Olds Ambassador, the... you name it... I tried many horns at trumpet hangs and I get the same range out of them... Here is a variable... some take more work than others... this doesn't make it "harder", just more work... and WILL effect the length of time it takes to poop out.