Halo 3: ODST Original Soundtrack

"Overall I think this score is a bit more intimate and personal. We're telling a human story, not a cyborg story. This isn't a space opera but a story that takes place on earth in one city. Although the player get's to inhabit the shoes of several characters, they still primarily should feel like one person discovering the mystery that lies behind the ruins of New Mombasa"

- Martin O'Donnell to Music 4 Games.

The Halo 3: ODST Original Soundtrack consists of music tracks composed by Martin O'Donnell and Michael Salvatori, is a two-disc set similar to the Halo 2: Original Soundtrack and Halo 3: Original Soundtrack. Tracks on the soundtrack includes some minor themes found in the previous Halo Soundtracks. The music tracks are listed in a chronological order of appearance in the game.

Disc One

 * 1) Overture - 5:37
 * 2) Yet Alone - 1:53
 * 3) These Darkened Streets - 0:51
 * 4) Time to Dance - 0:33
 * 5) Replacement - 1:47
 * 6) The Rookie - 7:27
 * 7) Strong Silent Type - 3:08
 * 8) Postpartum - 1:51
 * 9) Proceed with Caution - 2:28
 * 10) More Than His Share - 5:46
 * 11) Into the Breach - 3:14
 * 12) Become the Hunted - 1:54
 * 13) Lost and Unfound - 0:38
 * 14) Deference for Darkness - 6:35
 * 15) Rain - 3:07
 * 16) Trailhead - 1:40
 * 17) Guiding Hand - 1:48
 * 18) The Menagerie - 6:10
 * 19) Ground War - 1:02
 * 20) Oscar Mike - 1:47
 * 21) Unleashed - 1:11
 * 22) On the Prowl - 2:10
 * 23) Asphalt and Ablution - 6:04
 * 24) Still Grounded - 1:44
 * 25) Island of War - 1:02
 * 26) Hardboiled - 1:38
 * 27) Sneaking Suspicion - 1:40
 * 28) Traffic Jam - 5:50
 * 29) Look Both Ways - 0:48
 * 30) Street Sweeper - 3:24
 * 31) Rally Point - 1:38
 * 32) Neon Night - 5:35
 * 33) Where One Road Ends - 1:27
 * 34) Block by Block - 0:48
 * 35) Perception is Reality - 0:48
 * 36) Pounding the Pavement - 2:32
 * 37) The Office of Naval Intelligence - 8:48
 * 38) A Heavy Toil - 1:04
 * 39) Strong Medicine - 1:27
 * 40) Uphill, Both Ways - 1:36
 * 41) Access Denied - 2:08
 * 42) Infestation - 1:02
 * 43) Clear the Air - 1:31

Disc Two

 * 1) Bits and Pieces - 7:01
 * 2) From the Ashes - 2:32
 * 3) Dead or Gone - 0:56
 * 4) Premonition - 1:29
 * 5) Something Like Sorrow - 2:04
 * 6) Skyline - 6:58
 * 7) No Response - 1:23
 * 8) Pick a Target, Any Target - 1:33
 * 9) Love at Long Range - 1:39
 * 10) Air Traffic Control - 2:23
 * 11) No Stone Unturned - 3:21
 * 12) Cast Aside - 1:33
 * 13) Nox Aeterna - 1:06
 * 14) Marching On - 0:42
 * 15) One Way Ride - 6:48
 * 16) Borrowed Time - 1:49
 * 17) Anywhere but Here - 1:29
 * 18) The Calm Before - 1:18
 * 19) Let It Burn - 2:12
 * 20) The Light at the End - 7:49
 * 21) Another Rain - 2:32
 * 22) Through the Divide - 1:34
 * 23) All That Remains - 1:50
 * 24) Heart and Mind - 1:53
 * 25) Data Hive - 6:01
 * 26) We All Got Secrets - 1:33
 * 27) Only One Way In - 1:39
 * 28) Core - 1:34
 * 29) Heart and Mind - 1:53
 * 30) Special Delivery - 10:21
 * 31) From Bones - 1:18
 * 32) Still Strong - 1:10
 * 33) Extra Firepower - 1:39
 * 34) Mercy Plea - 3:11
 * 35) Hell of a Night - 3:03
 * 36) Finale - 8:10
 * 37) From the Ashes (reprise) - 1:12
 * 38) Orbital Drop Shock Trooper - 3:43
 * 39) Old Friend - 1:07
 * 40) Reborn Relic - 0:51
 * 41) Prepare to Drop - 1:17

Trivia
The movement "Orbital Drop Shock Trooper" from the Finale has a runtime of 3:43, a reference to 7|seven and possibly the eponymous Monitor 343 Guilty Spark. Additionally "Prepare to Drop," named after the game's tagline, has a runtime of 1:17, a reference to Master Chief.

It seems that Marty O'Donnell was going for more of a jazz perspective. In Deference for Darkness, there is a short saxophone section. More brass appear to pop up more in this soundtrack than the others. However in tracks like Skyline, it has the same variety of electric guitar, string, percussion, and other instruments; it is this combination and mixing that makes the Halo soundtracks so renowned and recognizable.