Would it be possible to set a Credo...for 3 voices with the chant melody being prominent within the piece?
Missa Regiæ by Henri duMont makes for an excellent model, although it is indeed in Latin. But it is only pseudo-gregorian (which is to say, gregorian imitative but not authentically ancient chant). https://youtu.be/fFxaaXqPvWUI can't think of a single composed Mass I'd want to hear week after week; even Mass XI gets old.
Oh, the horror of chanting the most ancient prayers of the Church! *clutches pearls*we've had parishioners switch from the principal Mass to other Masses when we began chanting the Responsorial Psalm about six years ago.
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