Sounds like that particular note may be right on your upper passagio, thus the difficulty.
Here's a few things to try that may free the note up for you:
Think TALL and NARROW. Watch yourself in the mirror as you sing the piece, and pay particular attention to what your mouth and jaw do as you "prepare" for that note. If there's any "spread" - i.e., horizontal movement - in the mouth, DON'T DO IT. Instead, think vertically, and simply allow the jaw to drop (loose and "floppy") open a bit more to accommodate the higher pitch. Don't force the jaw down.
Also, make sure you're not using jaw to create the vowel sound. At a certain point, articulation of the vowel is mainly a matter of THINKING the vowel sound, and not actually physically trying to produce it. At and above the upper passagio, the vowel sound should be produced primarily by the tongue position (physically) and by THINKING the vowel sound you want to sing. Jaw has NO role in articulation when singing, and lips should have a minimal role when singing that high, except to allow the opening necessary to produce the note easily.
Focus your tension into your buttocks, and think about "compressing outward" below the diaphragm. I find a quick clench of the buttocks as I attack the high note actually helps "propel" the note, and refocuses my tendency to tense up to a muscle that won't interfere with the quality of the sound.
Think about keeping your resonance deep - imagine the note as an elevator, and the resonance depth as the counterweight. As the elevator rises, the counterweight must drop even further. So the higher you go, the deeper your resonance should be. If you deepen the resonance, you're less likely to "overshoot" the note and sing it sharp. By the same token, don't forget that the elevator must go up an equal distance in the opposite direction from the counterweight - so don't simply darken the note (which will "flatten" it) - shoot that "laser" through your cranium to sing the high note, but also allow the jaw to drop open freely and THINK depth of resonance at the same time.
If starting a phrase with a trouble high note, breathe into the shape of the note - i.e., the shape your mouth will be in when you sing the note.
Keep the lips moving. I find that this helps eliminate "lock up". If you're singing an ascending pattern (like the one you describe), it can help a lot to simply "readjust" the mouth and jaw on each note to ensure that they remain loose, "floppy", NOT tense. I find this also helps on long coloratura passages where, by the end, I might otherwise have "locked" the lips and jaw into a certain position, which will make it more difficult for the breath to flow freely and get me to the end of the passage with the same energy and resonance that I had at the beginning (this is probably true with ALL long passages, but I find that "lip lock" tends to be more of a problem for me on upward-ascending high phrases, and on long coloratura runs.
Work on exercises that involve arpeggios that move up to - and through - your upper passagio. One I particularly like is singing the following pattern very lightly - think of the voice as a butterfly flitting from one note to the next and landing on each for only a split second: 1-3-5-8-10 (an octave above the "3" below)-8-5-3-1 on a series of different vowels (for example: C4-E4-G4-C5-E5-C5-G4-E4-C4). Another I've found very helpful for "conquering" the high passagio problem is (Italian closed vowels):
1 8 1-2-3-4-5-6-7-8 i a i i i a a a a i
The ascending scale should be at "coloratura speed".
Then you can reverse the exercise:
8 1 8-7-6-5-4-3-2-1 e o e e e o o o o e
The descending scale should be at "coloratura speed".
When you practise the piece (without the piano) try "transposing" it, both up a half and whole step, and down a half and whole step. I find this can help a lot, because my body stops associating that particular trouble note with a particular set of sensations. Doing it slightly lower, helps me feel that note with deeper resonance and more ease, while doing it higher helps me better "shoot for" the "laser through the cranium" sensation. Then I go back and sing it in the correct key, and it always feels easier, particularly after singing it a half and whole step too high.
Finally, finally, finally: Do everything you can to stop obsessing over your trouble note. That is a sure way to set yourself up for failure.
Good luck!
Karen Mercedes http://www.radix.net/~dalila/index.html ________________________________ That man is the happiest who is most thoroughly deluded. - Erasmus
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