I did not purchase this from Amazon or from anywhere else -- it was a Christmas present.
Beg, steal or borrow to get this treasure if you are an early music enthusiast, because essay CDs don't get any better than this. It is impeccably presented, with scholarly texts and imaginative esays in the form of a hard cover book in several languages, with full colour illustrations and many documents from the period. There are three CDs accompanying the book, and the whole will provide you with many hours of discovery, pleasure and study.
The participating musicians -- Jordi Saval, his ensemble and the superb Montserrat Figueras are all at the very top of their profession, and the music is supplemented by Latin and French texts of the times, such as, for example, the Papal Bull from 1252, "Ad Extirpanda", which establishes the Inquisition. That and the other similar texts are read by legendary Rene Zosso, the masterful interpreter (and singer) of medieval poetry.