The Gun Pointed at the Head of the Universe is a song included in the Halo: Original Soundtrack.
It runs for 2:28.
The name of the song is most likely in reference to the Halo installations, or the "guns pointed at the head of the universe". It plays at the beginning of the Halo: Combat Evolved level Two Betrayals.
It is also a checkpoint in Halo 1, during the level "Two Betrayals". Template:Halo Music