This is my current jam. It's so beautiful! It's a Nativity Great Doxology. I sang this with a very good choir and it was intense and very moving. I'm going to put in a request that we sing this at the church I'm at now:
On the subject of the Polyeleos, Psalm 135, I remember that this version was once posted on RVF 2.0. Roosh once asked the poster whether he had created it himself; if not, he should provide the credits. However, to Roosh’s surprise, this version of the Psalm was entirely composed by the poster.
Here is another improvised version of Psalm 135. It isn’t like any of the common tones, but to me this version is also very good. It is also available on Spotify, and I usually play the entire album.