Just wondered if anyone has any thoughts on this. I am a 52 year old trumpet player. My background is British Brass Band. I switched full time to trumpet 2 years ago. I have been working up to a concert as a member of a horn section performing Blues Brothers and Phil Collins (Vine St. Horns) (( I am not a Harry Kim or Dan Fornero but I try!)) style material. I have noticed a change occurring to my embouchure. I have always played cornet and trumpet with a pulled in setting, lips flat/parallel to my teeth. What’s happening now is that I am becoming increasingly aware that my lips are now going into a pucker with the sensation that the mouthpiece has moved away from my teeth. As a consequence I am losing some control of my playing. My sound is the same it just feels different producing it. I play a Yamaha 6335 heavy wall on a Denis Wick 3 mouthpiece with tone booster. As this happened to anyone else?