> https://www.youtube.com/watch?v=twzmflIdYmw

I have a CD of Hillier's album (one of the first ways I was exposed to Pärt):

* https://www.youtube.com/playlist?list=OLAK5uy_lmpgHbTQHjWV6o...

See Summa (Credo) and perhaps Seven Magnificat Antiphons in it.