At what note does your jaw Need to drop?

[random1destiny]

I've been working on minimizing my jaw movement to reduce unnecessary tension when going up my range and it has definitely helped me reach notes with much more ease. However, now that I've gotten rid of a lot of the unnecessary tension, I notice that in the notes above tenor C I notice that the notes are harder unless I start stretching my jaw down to (I think) facilitate my larynx tilting down. If I don't stretch the jaw down it gets really hard to go up, but if I do I can get another half octave. Is this the point in the male voice where it becomes necessary to drop the jaw wider? Or should I strive to be able to go higher before needing to engage my jaw? I've seen some SS instructors doing lip bubbles way higher than tenor C, and I have but only occasionally, my jaw usually wants to open up and sing an open vowel. But they've also said in other videos that jaw should drop when very high.

[SilentMind]

I too would like some wise words on this topic as I've got a busted TM joint that swings my whole jaw to the right if I open my jaw 'taller' than about a thumb-width. My own experience is somewhat conflicting on the matter as I've had occasions where high, relaxed and resonant singing is apparently helped by either an open jaw or a more narrow posture with a small amount of poise (bite / hold perhaps but I'm still confused with all the terms).

The tone of the mouth resonance seems to shift a lot according to jaw position and I'll admit to using this as a stylistic device from time to time. Even though I've begun to dedicate time to improving my voice I still enjoy a bit of ugly tone in my singing, a guilty pleasure perhaps. Cant sing along to Tom Waits with a sweet tone can ya ? Sorry, I digress!

[VideoHere]

i don't think it has to do with any particular note but generally it opens a little more the higher you go and that also depends on the vowel (and the singer as well).

[WebAndNet.com]

How does minimizing jaw movement reduce tension?

[random1destiny]

I think there is a tendency to over-move the jaw in some. An exercise I learned in singing and the actor is to lightly touch the roof the mouth with your tongue and sing without biting down and you'll notice that except for m's and p's, etc, you barely need any jaw movement. That said, for very high notes I feel like my jaw does need to be dropped down but I was wondering where that becomes necessary, if at all.