We might be including this before the beginning of Christmas Mass during the Night, using the text from the appendix of the Roman Missal. I don't see anything in the GIRM regarding who would recite or chant this, or from where it is proclaimed. I assume a deacon, lector, reader, or cantor could proclaim it but not from the ambo. Are there any rubrics in other liturgical books?
We've long done it before Adeste and at the end of a half-hour choral prelude, antiphonally with two cantors. Some day I'll have to ask about having it follow the procession and at the ambo, though.
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