 As the performer ascends in pitch, he or she will either move the lips and mouthpiece together slightly up towards the nose or pull them down together slightly towards the chin, and use the opposite motion to descend in pitch.Whether the player uses one general pivot direction or the other, and the degree to which the motion is performed, depends on the performer's anatomical features and stage of development.The placement of the mouthpiece upon the lips doesn't change, but rather the relationship of the rim and lips to the teeth.