Library Suite

Library Suite is the twenty-first track in Halo: Original Soundtrack, and plays mainly in the Halo: Combat Evolved campaign level The Library.

Overview
Library Suite is composed of five ambient tracks.

The first section (0:00-1:08) features slow bell chimes accompanied by eerie synth ambiance. The ambiance repeats before fading out. This section first plays in the level The Truth and Reconciliation, when John-117 and Fire Team Charlie first boarded the eponymous ship. It plays again in the level The Silent Cartographer, when John-117 approaches the passage to the security control. It plays for a third and final time in the level Keyes, at the beginning, when John-117 reaches the hole at the hangar bay.

The second section (1:09-2:41) fades in with a light synth ambiance piece, featuring the Shepard tone (2:02-2:20) followed by various digital effects overlaid on top of each other. They build up to a climax before fading out. This section plays in the level The Library, after John-117 has passed through the third floor of the Library's index chamber, up until the point where he reaches the final door, which leads to the fourth floor of the index chamber. A version, mixed with the earlier track Devils... Monsters..., plays when John-117 is waiting for 343 Guilty Spark to unlock a door in one of the hallways on the third floor.

The third section (2:42-4:07) fades in, featuring a high synth ambiance accompanied by digital chimes and a low synth in the background. This section plays in the level The Library, when John-117 takes the elevator from the first floor to the second floor of the Library, up until the point where 343 Guilty Spark leaves John-117 at a locked door to reset the backup unit for a drone control subsystem.

The fourth section (4:08-5:03) cuts in with a muted chord, muffling the synth ambiance. The high synth ambiance returns with a progression, joined by digital chimes, and together they play in repeat, sometimes interjected by the muted chord. This section first plays in the level The Library, when John-117 waits for 343 Guilty Spark at the first locked door on the first floor of the Library. It plays again in The Library when John-117 is passing through the second floor of the Library's index chamber, up until the point where he reaches another locked door. A version, mixed with the siren sounds from the later track Shadows, plays in The Library when John-117 is defending his position at the locked door leading into the third floor of the index chamber. It continues, without the siren sound effects, when he passes that locked door, up until the point where

The fifth section (5:04-6:47) features muffled ambiance, joined by various eerie ambient instruments. A light synth returns before fading out together. A shorter version plays in the main menu of Halo: Combat Evolved, and during Halo: Reach matchmaking.

Arrangements
The piece was arranged into Dewy Decimate of the Halo: Combat Evolved Anniversary: Original Soundtrack.