Music for the opening

The music we will be creating for our project will hopefully mimic the sort of tune you would hear in a musical jewelry box.

The first music I made used a lot of violins/cellos and light piano notes over low piano notes to create an effectively creepy and cinematic sound.
Our next task with music is to make it somehow build suspense.
I had the idea to make the sounds of thunder at erratic times as a lot of the flashes appear on screen.
The sound will hopefully mimic something like this (without the voice):


perhaps it could be somewhat darker than that, but involving the same sort of tune.

Antoina