A few weekends ago I located a contratenor part from a polyphonic Gloria setting in the online virtual library of the Saint John's University Hill Museum & Manuscript Library Special Collections (Collegeville, Minnesota, US).
The above is a composite of three images from the digitized source online (images © Hill Museum & Manuscript Library):
https://www.vhmml.org/readingRoom/view/519201
Perhaps this is already a known fragment, but it was not on DIAMM when I found it, and its host archive did not say more about it than its being a musical parchment fragment reused as a cover for a volume of what they have labeled as 17th c. notarial records. (After a glance at the contents, it seems more like theological/medical/philosophical musings than legal records.) I haven't been able to identify the provenance of the volume, but the front flyleaf has French verse copied onto it and the owner seems to be a certain Johannes Burchard, master of philosophy and judge, though I can't quite decipher the location. Perhaps North-east France?
My guess is that the reused musical parchment is from between 1475-1525-ish, perhaps on the earlier side of that range, since it uses the label Contra instead of Altus. A few notes of the verso side are visible through the wormholes in the front board on some other images. I did not manage to identify the piece (probably from a 4-part setting, with this being the top-right side of an opening), but I only made a cursory check in a few online sources. Someone who knows this period better may be able to identify it right away.
Its new DIAMM page is here:
https://www.diamm.ac.uk/sources/4979/
I hope this is useful to someone studying polyphonic Mass settings from this era.
-Richard
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