Now that's hard!
The title "Asylum" made me think of insanity as that was what this was bringing on in me. Don't get me wrong, it started out very peaceful, but you knew something more extreme was going to happen. It was the lack of creepy music that made that part scary. I love at around 1:50 when you start to hear those voices. They don't seem to be even singing just moaning in a very soft way. There was stuff like rattles and pages being turned.
Then, at 2:20 it slowly begins its descent into madness. It gets louder and louder as it goes on and appeals more to the insanity of your senses. This is a true work of art given how it kept adding more creepiness as it went on. The loud stuff at 2:56 is most effective and it gets more inane from even there! Thank you for such a great audio piece.