I heard someone talking about this in a post from before and tried to look it up on google but people just used the term alot without going into great detail about what it really is. Can someone else explain to me more about it? Why it is so popular? What it really is? Why do or should people use it? Just any information on it. Another thing is that I realized that it seems a bit more comfortable for my playing to play higher notes with my lips curled in. (The part in the mouthpiece) Recently I found out I can do basically the same notes with the same or sometimes better tone quality by just relaxing the part of my lips that is in the mouthpiece. Shouldn't I really be using the 2nd one for my higher range when I practice and play or does it not matter?