Mausoleum Suite

200px|right Mausoleum Suite is a suite of songs included in the Halo 2: Original Soundtrack. It includes Destroyer's Invocation, Falling Up, Infected, and Shudder. Falling Up, which plays when the Arbiter gets his armor, is often referred to as the "Arbiter's Theme,"as it is always played in Halo 2 during Arbiter missions. The middle part of the song, and the end of Shudder, are the same as Ancient Machine. Infected starts with a slow tribal beat, and vocals similar to Ancient Machine, before descendng into cascades of chaotic synth effects and distorted guttural vocals(which may be another secret message). Shudder is a remix of Shadows from the Halo: Original Soundtrack.

It runs for 8:10.

Hidden Message
When the track is played backwards, a hidden message can be heard. At normal speed it is inaudible, but sounds similar to the Gravemind's voice. However, when sped up words can be heard and the voice begins to sound like that of a Prophet. It is more likely that it is 032 Mendicant Bias because Gravemind or the prophets wouldn't be seeking for forgiveness nor does Gravemind do anything that may warrant a reference to "living in a prison of [his] my own demise", but this may be a reference to his being trapped on Delta Halo. Whether either is the owner of the mysterious voice, or something/someone else is debatable.

Trivia

 * The beats of the song have a striking resemblance to the beats heard in the theme music for Marathon 2: Durandal.