If there's anyone with music-history-related scholarship or access to special articles and so on then I would greatly appreciate the help, because I certainly can't find the following on my own,
During the Renaissance, there's Josquin Des Prez, who has written a Myssa based on a piece of an almost unknown composer named "Eneas Dupre", that piece survived and was for a while thought to have been written by Josquin Des Prez himself, only to later be accepted as work of said Eneas Dupre.
I can't find a single thing about that composer, as the search engines just show the sidelined tips of information. I've been told there was an article or a PhD of some sort written about this very issue but I can't seem to find anything. Help greatly appreciated!
What's the name of the piece, and what kind of information are you looking for? Just biographical info?
Fair warning, Renaissance and earlier composers are notoriously lacking in information, so there may be next to nothing available, even with access to scholarly publications.
I am going to show you one of my great music historian secret weapons... I am sharing it only with you, and no one reading over our shoulders, so do not show it to anyone! Nah, show it to everyone, it's a cool thing and it's a pity no one knows about it. :) It is glamorously called The Music Sack, and here is your dude. It has a list of books/articles/reference sources where he may be found, as well as basic biographical information. It actually looks like there's a lot out there about him, comparatively, I've researched a lot weirder dudes with less on them, she gestures vaguely to flair. Actually looks like he was a bit in vogue in the 80s.
And here is his uniform Library of Congress subject name. There are 12 dissertations on him listed, do any of them match what you're looking for?