One of my favorite players is Roy Eldridge, and I think that one of his greatest records is "Heckler's Hop." Here is a link of that song: Grooveshark - Free Music Streaming, Online Music One part of this record that really stands out to me is at about 1:33 when Eldridge hits what I think is a double A. However, this double A has a remarkable clarity of tone that I've never heard any trumpet player get in that range. Certainly, players since have gone higher and higher than that. But I've noticed that even the greatest professional players tend to have a change in timbre in that part of the upper register that comes off as a more pinched screech. Do you guys think that even a lot of pros are copping out when it comes to playing the super high notes properly? If so, what is the reason for this? I've read that Eldridge had false teeth and consequently had to really limit mouthpiece pressure. Maybe players are using more pressure to supposedly seal the air than they really need to?