Are there any documentaries on the subject of Medieval and/or Renaissance western music and its practice?

Question

I am looking mostly for the essential information on polypohony, gregorian chant, techniques of the time and their development etc, in order to get a grasp of the subject, names and times so I can later on focus my study on books.

Answer 1

You might try Alfred Music publishing. They have a number of videos on subjects like this.