Most of us know about the Ambrosian Gloria as it appears in the Graduale and Liber U. Is there a source for a melodically similar Kyrie, Sanctus, and Agnus?
Yes, I've look all over this page and find a Kyrie and Gloria but no distinctive Ambrosian Sanctus or Agnus. Not here, or here or here or here. I'm at a loss.
Besides that, i think that some ambrosian Kyrie and sanctus has ben published in Graduale simplex..., I'm not sure, i should verificate. Ambrosian graduale (Antiphonae missarum) in postconsiliar edition is available...
I had a look, too...The sanctus you found page 29 of the Graduale simplex is the same indicated in Antiphonale missarum simplex juxta ritum s. eccl. mediolanensis (p. 32). The normal Antiphonale Missarum juxta ritum etc. presents another ornated sanctus page 597.
The Ambrosian Mass does use a version of the Agnus Dei, but as part of the Proper at Masses for the dead (only), where it appears as a Transitorium (chant at Communion). Here it is, from page 594 of the Antiphonale Missarum (1935).
The music and text could be adapted to the Roman Rite, by (1) changing the first two phrases dona eis requiem into miserere nobis (omitting the penultimate note), (2) changing dona eis requiem sempiternam into dona nobis pacem (omitting all but one of the notes for requiem sempiter-), and (3) entirely omitting the last phrase et locum… in gloria.
However, this chant would be stark and unadorned in the extreme!
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