If you are looking to verify you have the "proper piece," here are the musical characteristics:
Earl D. Irons was a renowned bandmaster at Arlington State College (now UT Arlington) and a founding member of the American Bandmasters Association. He recognized a common struggle among brass players: the "stiff" embouchure. Players often focused so much on power and high notes that they lost the fluid, vocal quality necessary for true musicality.
: To build endurance without damage, follow the classic brass rule—if you play for 10 minutes, rest for 10 minutes. Where to Find the Book