"Jason Stoessel has an article on this. The original article is by Mark Everist I believe — will find citations of both later if I’m pinged.
one of the motets I identified as a concordance of Plausu from the Cortona fragments. It’s…"
"As Prof. Arlt says, it is an extremely interesting piece (or related collection of pieces) -- transcriptions available on request. It features a curious phenomenon that I only know of from Swiss sources, that of the contratenor against solus…"