I always tell my students that dropping the jaw to breathe not only trains you to open your mouth wide to breathe, it also trains you to open your mouth wide to hit the high notes! Yes, you heard that right. A half open mouth will only deliver half the goods. I think that's a pretty good analogy. When your throat is wide open, your voice comes through more sharply, you'll have a better tone, and you will hit the high notes with greater ease. So the next time you're having trouble sustaining a note, check your breathing. Chances are you're not breathing correctly (for singing). I have corrected this problem with my students and every time, it has made a world of difference.
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