Interesting thread. A lot of good posts. A lot absolute baloney too. Playing trumpet is a balancing act between a lot of different factors, and mouthpiece pressure is one of those factors. Often times it's more a difference in perception of how much pressure is used rather than how much actual pressure is used. I read an article that I believe was published in the ITG Journal that talked about mouthpiece pressure and they figured out a way to measure it. They did a survey to find the players who admitted to using a lot of pressure and those who didn't think they did. Ultimately, everyone seemed to be using about the same amount of pressure, and it increased as range became a factor. But again, it's a balancing act - too much pressure is definitely bad, and it's something that creeps into my playing when I'm doing a lot of gigging with the party band, although it hasn't really happened since I became aware of it. These days I take steps to prevent the use of excessive pressure in my playing during my normal practice routine. I think that Rowuk has a good point though - most players will go through the pressure thing when they start to move forward as trumpet players and more demands are placed on them in terms of volume and range. The trick is to keep it from becoming a detriment and to keep it in balance so that it doesn't become excessive.