There is so much very good mediaeval music around that it would be difficult to choose favourites.. However, Gregorian Chant aside.. try a Group called FRETWORK, wonderful music on original instruments. Also a group called Tersichore. Albums such as Music from the Age of...Richard First , Michael Angelo.. Elixabeth First and so on. There is also a very fine Christmas Album called Thiz Yoole.. I cannot recall the artist..but will send on more information should you like to have it. Aginvourt Carol was beautifully recorde on the second Silly Sisters album.