Oh, and a documentary, "24 Preludes for a Fugue" by Dorian Supin. You'll maybe notice some of Arvo Pärt's quirky sense of humor there as well: https://www.youtube.com/watch?v=dRwTgme1_KE
Thank you for the documentary link. I've been looking for a certain Pärt video I came across years and years ago without success. But now took a small peak to that and I think this is it!