Liturgical chants in the Russian orthodox tradition. Some of these I know already, but this in a slightly different version. Since these are sacred, liturgical songs I hesitate to say “performance“. The Vocal Quartet of Nice did some good work on the first part, so this is the second.
I wrote earlier about the monks of Chevetogne singing these songs, but I must say, these come very close, and at least it is a variations of that, the recording I know so well. Nice deep voices with a lot of expression. Somehow the liturgical works for the Eastern Orthodox Church sound way better than the Gregorian songs.