I'm an adult beginner who just bought his first clarinet! It hasn't arrived yet, but it will include a Vandoren 5RV Lyre mouthpiece. I've read a bunch of threads about how the Hite Premiere, Fobes Debut and Behn Overture are excellent mouthpieces for beginners. My question is: Will I be better served purchasing a Debut or Overture to aid in the formation of my embouchure, or it the Vandoren 5RV Lyre OK for a beginner? Put another way: Is there any harm in starting on a 'non-beginners' mouthpiece? It's a little difficult separating adult beginner info from that more suited to 5th graders! I'm mostly into playing jazz, and my main goal is being able to jam on Real Book melodies and play simple solos with some friends (I have been playing guitar for 20+ years, so I know music theory, how to sight read, etc.). I will find a teacher, but maybe not until summer. I'd like to play the clarinet in the meantime!