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Clarinet mouthpiece. If you purchased or received a clarinet and play the mouthpiece that originally came in that case, you are in for a big surprise. The dirty little secret is that most stock mouthpieces that come with the clarinet are horrible, usually very free blowing for the very, very beginner clarinetist.
This video highlights my career as the West Point Band Drum Major and Clarinetist showing some of the earliest band promotional photos in the early 1990s, to various Drum Major, Clarinet Section, and Concert Band photos to the end of my career. By the way, the Old Glory Triumphant March was among my favorites to program on numerous ceremonies. Listen to it to hear the "fireworks" from the clarinets and piccolos.
BUYING A GOOD QUALITY MOUTHPIECE IS THE SINGLE BEST IMPROVEMENT YOU CAN MAKE IN YOUR CLARINET SOUND QUALITY. So, if you are financially strapped and cannot afford a clarinet now, search for some good mouthpieces. Clarinet-Now.com is a good place to start.
Starting with a good mouthpiece is important. I usually have my students try the Vandoren M-13 Clarinet Mouthpiece, Vandoren 5RV-Lyre Mouthpiece, and the Vandoren M-30 Mouthpiece.
Understand there are many, many, many more types of mouthpieces. But, these are a good place to start.