Hello Mr. Grant,
I suggest you ask one of the Norbertine priests at your parish if they can get you a copy of the setting found in Hymns, Psalms, and Spiritual Canticles. They use that hymnal at the abbey. From what I remember the antiphon you are looking for is in the section for the Chrism Mass on Holy Thursday.. but that's just a guess.
Thank you all so very much! I actually have a copy of this hymnal on my shelf (just the pew edition) so the PDF with the accompaniment is very helpful! Also, thank you for the Chabanel settings ... wow, this is great!
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