Bravo ! This track is fantastic...
Everything is made with such a good taste... Waow ! Your instruments all sound more than real and the selection you made is surprisingly homogeneous though it could have been foolhardy : switching from harpsichord to accordion, everything rythmed on atmospheric percussions and accompanied by creepy child voices. Even when the chant is a bit out of tune (no offense :P, actually I'm sure you made it on purpose), it contributes to the overall atmosphere.
I'm also very impressed by your composition. It's perfectly written, both vertically and horizontally and I really appreciated to be transported on the continuity (actually a waltz is nice for that ;) ), I mean, not feeling a hammer hit on the face every three times is very enjoyable. Everything was super smooth and articulated with delicacy, which allows you those great modulations and these long sentences.
My musical theory course is far away from me now and I hope I didn't say some bullshit :D (particularly in english). Anyway, I just wanted to congrat you for what is, in my opinion, an awesome job.