Frankly, I think the orthodox have some of the most transcendent chants that exist in Christendom. I find anything by Tchesnokov to be particularly beautiful, and this is certainly in that vein. There's no doubt that this music is 'sacred' through and through. Haunting, and beautiful.
My only sadness is that these languages are impenetrable to me, which makes transcriptions terribly difficult, and I certainly couldn't coach a choir through singing it as it is.
(I did have to chuckle at about 3 minutes in where there's a pop and they clearly spliced two takes together; the pitch even shifts a bit. Sounds like a record pop.)
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