Originally Posted by
BillyD
Ok, but let me put my question another way. Is it that air just occupies space in the tubes at atmospheric pressure, and that for each note the musician wants to create he needs to move all that stagnant air up to a certain speed? Or is it that the air in the tubes is held under pressure until the musician pushes it just a small amount to make a note? It just doesn’t seem possible that the human lungs can push all that stagnant air against the inherent drag of all those narrow tubes for each note he wants to play. But if so, that’s incredible.
abshipp summarized it pretty well. It doesn't take a lot of air to play, unless you're playing loud.
One of the exercises I work on is playing rapid lip slurs for as long as I can on one breath. Even in the not great shape I'm in now, I can sometimes play 45 seconds on one exhale.