I just want to start off by saying that I adore the soundtrack for this game. Though simple, it really captures the atmosphere really well! I did have a question about a particular track though. It plays both in front of the church during The Ceremonial Night and in the a portion of the good ending - Here's a sample from a video that shows it:

Even though it's distorted, it sounds very familiar but I, for the life of me, haven't been able to find it anywhere else! Is it an original creation for the soundtrack or was an existing hymn/chant sampled for it?

Again, absolutely adore this game!