Been pondering this for years. We have been preaching and been preached to about the importance of air...air stream...air speed, etc.... Also about the "correct"embouchure. Teeth has come up a time or two, also. But what about the tongue? I remember a while back there was a clip posted here...there was a black guy who was hitting extreem high notes, and there were a couple of other guys there with him (from what I remember they were from the "Airmen of Note" USAF Band). They were saying....guessing maybe..... it was the position of the tongue. This was a home video taped in someones house.
Anyway, do you think that the tongue has anything to do with the very high register? Is it as important as say air stream and/or embouchure? How about tongue shape? How about the "lip trill"..especially the 3,4,or 5 note "Shake" that MF used so much. Is that tongue, air or lip? When whistling and trying to do a "shake" it is the tongue that makes it happen....or, NOT happen in my case. I can tell you for a fact that all tongues are NOT the same. I have almost ZERO flexability in mine. Just wondering if someone's ability to go high can be restricted by the (mis)shape of the tongue.