Mouthpiece Comparison: Do Smaller Mouthpieces Help High Range?
The answer, quite frankly, is no. They do not. Particularly when you're used to larger mouthpieces, switching to a small one can (at least in the short term)
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Harrelson 5MM Modular Mouthpiece Review - Part 2
Review: Trumpet Mouthpiece - Bach 5C Megatone - Mismarked?
Vincent Bach Mouthpieces (9A, 6B, 11/2B, 5V For $150 And Getzen 7C (free With Other 4) R/trumpet
Plastic vs Metal Trumpet mouthpiece - Is there any difference in sound?
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Mouthpiece Wars: 3E vs 7C! Stop the 7C insanity - Bach 3E Overall WINNER!