The Gun Pointed at the Head of the Universe
From Halopedia, the Halo wiki
The Gun Pointed at the Head of the Universe is the eighth track included in the Halo: Original Soundtrack.
It is composed nearly entirely of percussion, only having a deep bass note towards the middle of the piece and some vocals at the end of the piece. The rest of the sound is produced by a combination of drums, auxiliary percussion and hand-clapping, which is usually unheard of in many tracks written for Halo.
The track can be heard:
It is reorchestrated into the following: