Okay, let me tell you that I turned on the light while I was doing this track!
This is a theme perfect for every horror trailer. It starts with a light and soft female voice singin a silly and childish nursery rhyme (which is an original theme that I wrote for this song).
This first calm piece introduces the evil hidden under the beauty; the song goes on with some heavy and distorted hits and massive impacts, underlining scary moments, along with some eerie sound effects (like ghost whispers, far screams and monsters breaths) and low drones.
The last 30 seconds are a classic crescendo of terror with a lot of risers till the final double explosion, with the creepy voice of the beginning.