Half-Life: Opposing Force soundtrack
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It is possible to extract all audio tracks heard in-game in the Steam version by navigating to
Names of the majority of the original tracks were revealed with the release of Blue Shift. Additionally, those previously named received new titles. When a track has multiple names, the Opposing Force title is listed first.
Originally, the Steam versions of Blue Shift and Opposing Force did not use their original soundtracks, but instead the Half-Life soundtrack by Kelly Bailey. This was, however, corrected when both games converted into the SteamPipe distribution system.
 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|
||0:17||Incoming: Played during the opening scene aboard the Osprey.|
|02||03||The Awakening / Orbit||
||1:11||Welcome to Black Mesa: Upon exiting the Black Mesa Medical Lab.|
||1:54||Welcome to Black Mesa: Upon encountering the Vortigaunt corpse with the Combat Knife impaled in its back.|
|04||05||Spooky Oozings / Listen||
||0:17||Welcome to Black Mesa: Upon falling into the pool of water immediately after entering the sewers of the Black Mesa Transit System.|
||1:03||"We Are Pulling Out": During the tram ride.||This is the only track to not be used in Blue Shift.|
||1:38||"We Are Pulling Out": When the hangar access door begins to shut close and the G-Man appears.|
|07||08||Spectre of Limbo / Trample||
||1:20||Missing In Action: When entering the test flame area.|
|08||09||Race from Doom / Bust||
||1:49||Friendly Fire: While encountering a group of Black Ops near the rail transit system.|
|10||10||Temple of Limbo / The Beginning||
||2:07||Crush Depth: While entering the elevator before rescuing the scientist in the teleport at the beginning of the chapter.|
|11||11||Wastes of Limbo / Lost in Thought||
||1:22||Crush Depth: While entering the room with the broken x-ray, immediately before Adrian's first fight with a Shock Trooper.|
||1:17||We Are Not Alone: Upon entering Xen for the first time.|
|12||13||Open the Valve||
||1:27||Vicarious Reality: When a Shock Trooper and Pit Drones teleport into the Observation Area of Biodome 02.|
|13||14||Stroke of Midnight / Run||
||0:54||Pit Worm's Nest: Upon dropping from the air vent at the beginning of the chapter.|
||1:25||Foxtrot Uniform: Upon entering the sewer maze populated by Voltigores.|
||1:26||Foxtrot Uniform: When approaching the Hydro-Electric Dam.|
|16||17||The Ticking Timebomb / Chamber||
||1:59||"The Package": Upon approaching the Black Ops mortar.|
||0:59||"The Package": While riding the lift at the end of the chapter.|
||2:05||Worlds Collide: While riding down the lift to the battle with the Gene Worm.|