Half-Life: Opposing Force soundtrack

	Warning! This article has yet to be cleaned up to a higher standard of quality, per our Cleanup Project. It may contain factual errors and nonsense, as well as spelling, grammar and structure issues, or simply structure problems. Reader's discretion is advised until fixing is done.
	You can help clean up this page by correcting spelling and grammar, removing factual errors and rewriting sections to ensure they are clear and concise, and moving some elements when appropriate. Please notify the administrators before removing this template.

The Half-Life: Opposing Force soundtrack was composed by Chris Jensen. It was reused for the Half-Life: Blue Shift soundtrack.

It is possible to extract all audio tracks heard in-game in the Steam version by navigating to steamapps\common\Half-Life\gearbox\media.

Initially, the Steam versions of Blue Shift and Opposing Force did not use their original soundtracks but rather the Half-Life soundtrack by Kelly Bailey. This was, however, corrected when both games were converted to the SteamPipe distribution system.

The tracks in Opposing Force (and consequently Blue Shift) have never been officially named by either Jensen or the developers at Valve and Gearbox. The unofficial titles that have come to be associated with the soundtrack over time originated from community-contributed online music databases such as Gracenote. Although the tracks are identical, several of the Blue Shift titles differ from what was given for Opposing Force.

Behind the scenes

The music was made with old equipment, including an analog 4-track recorder.

Several tracks were cut from the soundtrack. One of them, titled "Mishaps In The Reactor Chamber Part 1 - Track 03", was reused by Jensen for the Half-Life 2 E3 2002 trailer. Jensen uploaded the tracks on his SoundCloud account in 2014 at the instigation the wiki after having been contacted several years prior about his credits for the music of the Half-Life 2 E3 2002 trailer. They have been removed since then.

Track listing

Game #	OST #	Track title	Filename	Time	Level location	Comments
01	02	Scientific Proof	Half-Life01.mp3	0:17	Incoming: Played during the opening scene aboard the Osprey.
02	03	Orbit / The Awakening	Prospero01.mp3	1:11	Welcome to Black Mesa: Upon exiting the Black Mesa Medical Lab.
03	04	Name	Half-Life12.mp3	1:54	Welcome to Black Mesa: Upon encountering the Vortigaunt corpse with the Combat Knife impaled in its back.
04	05	Listen / Spooky Oozings	Half-Life07.mp3	0:17	Welcome to Black Mesa: Upon falling into the pool of water immediately after entering the sewers of the Black Mesa Transit System.
05	06	Fright	Half-Life10.mp3	1:03	"We Are Pulling Out": During the tram ride.	This is the only track to not be used in Blue Shift.
06	07	Storm	Suspense01.mp3	1:38	"We Are Pulling Out": When the hangar access door begins to shut close and the G-Man appears.
07	08	Trample / Spectre of Limbo	Suspense03.mp3	1:20	Missing In Action: When entering the test flame area.
08	09	Bust / Race from Doom	Half-Life09.mp3	1:49	Friendly Fire: While encountering a group of Black Ops near the rail transit system.	Considered by Jensen to be one of his favorite tracks for the game.
10	10	The Beginning / Temple of Limbo	Half-Life02.mp3	2:07	Crush Depth: While entering the elevator before rescuing the scientist in the teleport at the beginning of the chapter.
11	11	Lost in Thought / Wastes of Limbo	Half-Life13.mp3	1:22	Crush Depth: While entering the room with the broken x-ray, immediately before Adrian's first fight with a Shock Trooper.
09	12	Danger Rises	Half-Life04.mp3	1:17	We Are Not Alone: Upon entering Xen for the first time.	Considered by Jensen to be one of his favorite tracks for the game.
12	13	Soothing Antagonist	Half-Life15.mp3	1:27	Vicarious Reality: When a Shock Trooper and Pit Drones teleport into the Observation Area of Biodome 02.
13	14	Run / Stroke of Midnight	Half-Life14.mp3	0:54	Pit Worm's Nest: Upon dropping from the air vent at the beginning of the chapter.
14	15	Open the Valve	Half-Life16.mp3	1:25	Foxtrot Uniform: Upon entering the sewer maze populated by Voltigores.
15	16	Tunnel	Suspense02.mp3	1:26	Foxtrot Uniform: When approaching the Hydro-Electric Dam.
16	17	Chamber / The Ticking Timebomb	Half-Life03.mp3	1:59	"The Package": Upon approaching the Black Ops mortar.
17	18	Maze	Half-Life08.mp3	0:59	"The Package": While riding the lift at the end of the chapter.
18	19	Alien Forces	Prospero02.mp3	2:05	Worlds Collide: While riding down the lift to the battle with the Gene Worm.
19	20	Planet	Half-Life05.mp3	1:31	Credits