To a degree. I find the timbre of human voices does a great deal to soften dissonances, so it would sound rather different sung than synthesized. I wouldn't play it on the organ with anything but the simplest registrations, and perhaps not even then. On a piano, the dissonance would be far more abrasive. It makes frequent use of maj 7th harmonies and chords with added fourths (the latter being a major part of Eric Whitacre's harmonic language, whose work I admire).
Do you have Russian basses? Especially at the end, you have a tremendous number of low notes.
Also, in reference to your plea for dissonances, I should note that Durufle and Laurisden use dissonance to considerable effect, but that dissonance isn't valuable as an end in itself.
Oh, thanks for the reminder about the low notes! I'm considering transposing the whole thing up a step or so, and will in any case provide alternate voicings for two of the lowest chords. (The basses will need to manage a low "mi" for whatever key it gets sung in.)
And, yes, I agree that dissonance -- like all other harmonic tools -- is not an end in itself. (I hope I haven't treated it that way here.) The kind of work by Lauridsen and Durufle you mention would sound rather wonky on, say, a piano. Sung, though, the effect is quite different. By my earlier point I meant to suggest that when speaking of degrees of dissonance, timbre is not an incidental consideration.
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