The following disks can be found in the classical room of any major record store (Tower, Virgin, etc.). Some can be found at public and/or University libraries, and most can be found at our house.
Here are four (4) thematic discographies: Christmas music, Cantigas de Santa Maria and friends, Troubadour/Trouvere song, and Ars Antiqua. More such thematic discographies are on the way: say, one on the Minnesinger repertoire, one on the wild and wonderful world of the late 14th century, etc. Watch this space!