Right now, the tessituras are rather low for everyone; it's more like AATB than SATB, so you could probably make this easier by transposing it up, even to F major.
I think that it is lovely, quite lovely. One thing, though, that I would change were I doing it - that would be organ rather than piano accompaniment. I would not consider the piano. Further, the only independent instrumental part is the few bars of introduction. This anthem would be quite as effective, if not more so, sung a capella, sansintroduction. At any rate, it is beautiful, refreshingly unpretentious and clean.
@MJO: the accompaniment was intended for organ, but the limits of Finale NotePad are such that I could not put an organ in without having 3 staves. I just wanted the two. The accompaniment is completely ad libitum anyway: you could just start where the choir enters and sing a cappella from there.
I'm being thick, dense or stupid, I guess. If the accompaniment is "completely ad libitum anyway", what does it matter how many staves you have for the organ part? Similarly, wouldn't it take a skilled organist to improvise under all that dissonance without damaging the effect it seems you're trying to create?
Just for space saving purposes. I suppose the whole composition would be better a cappella anyway, but I included the accompaniment colla voce in case it was needed. A skilled accompanist can read in open score, but many who might be accompanying this might not be able to do that.
I particularly like your use of the f in the Alto as a pedal-tone; and also the transition from the fourth to fifth bars on p. 4, you think it's going to be V7-I, but it isn't: the addition of the ninth is attention getting but not distracting - at this point, as a choir director, I would make sure that there is no breath between "portare" and "Dominum", it definitely want's to be one phrase, perhaps you could put in a little warning about that? (Dotted slur?)
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