So much for the performers. As for the producers...
On the downside, it is painfully obvious that they made this album on a shoe-string budget. That can be a good thing in forcing the artists to stick to the music's purity instead of hiring a team of sound engineers to make it "sound" better, but there is absolutely no documentation about the songs, other than their titles and playing times. A sickly-thin album insert has a blurb in English and Italian about polyphony, told in allegorical style, with each paragraph in an alternating language instead of one section in each language. Go figure! Maybe the AltaVista translator they used for free had a one-paragraph limit.
But it also has a variety of styles, both vocal and instrumental, so it gives a nice overall flavor of what life might have sounded like in that little part of the world, during that remarkable little slice of musical history.