SAW SOMETHING COOL on YouTube. It appears Mr. Gregory Ceurvorst is singing the Chabanel Psalms with SATB harmonized verses. From what I can tell, he adapts the organ accompaniments for his singers:
Quite beautiful to hear those harmonies! If I were conducting, I might take a slightly faster tempo—but it seems like they’re singing in a large church, and sometimes the acoustic can dictate the tempo.