Psychotic by Alexander Nakarada
If you're looking for music to use that doesn't steal too much attention, turn back right now. "Physchotic" is a very iconic piece inspired by bands like "Tool" and "A Perfect Circle".
Even with all the horror stuff I've written, this is by far (in my opinion) some of the creepiest music I have in store. It's so insanely unpredictable and very interesting with a very dark feel and rhythm that doesn't make sense.
A lot of different parts with diversity in instrumentation, rhythm and style overall. Just try to understand the rhythm and the tempo. I still don't understand what the hell is going on.