from "Practical Physics for Trumpeters and Teachers" by Renold O. Schilke April 1977 The Instrumentalist "It is not necessary for the the air to move thought the instrument. I have demonstrated this at clinics by having a tuba player blow smoke into his instrument. He can play for over a minute before any smoke begins to trickle out of the bell. The pattern set up by the player in the air is more like what happens when you drop a rock in the lake---energy impluse travels along lifting and depressing the water ( making slight waves), but does not move the water to another area." what do you guys think? I was thinking that goes along well with the Jacobs quote of " I do not fill the horn with air, I fill the horn with vibration".