Trombonist
...or every musician the placement is slightly different. Most musicians tend to place the mouthpiece slightly more to the bottom lip as it tends to be the stronger of the two. The sides of the mouth should not move when changing registers. These muscles are used to counterbalance the embochure and DO NOT CHANGE THE REGISTER. For good posture while sitting one must sit up straight so the air stream is not cut off. The back must be off the back of the seat and spine straight. Feet must be put on the ground for stability. Also make sure there is room for you to move around do to tendency of movement in between and during pieces of music. While standing one should stand with elbows away from the body and arms at a ninety degree angle for easy playing. If elbows are at the sides of the body then this wil...