Devils... Monsters...

Devils... Monsters... is a song included in the Halo: Original Soundtrack. It runs for 1:32.

It repeats several notes many times, with carefully placed variations designed to surprise the listener. If the timing is right, and a random, but strong, note is played when the player is attacked by surprise, it can bring a tense and suspenseful feeling to the game. Parts of this song are used in later games in the Halo series, most notably for the Halo 3 boss fight with 343 Guilty Spark in the song Halo Reborn.

The name of the song is a reference to The Flood, as it plays in the Library and for many of their other appearances. You can listen to it here.