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

Many of the original tracks had no name on the Opposing Force disc, but received one on the Blue Shift disc. Additionally, most previously named tracks received a new name on the Blue Shift disc as well. When a track has multiple titles, the Opposing Force title is listed first.

Track list

# Title Location played
1 “Scientific Proof” Incoming: Played during the opening scene aboard the Osprey.
2 “The Awakening AKA Orbit” Welcome to Black Mesa: Upon exiting the Black Mesa Infirmary
3 “Name” Welcome to Black Mesa: Upon encountering the Vortigaunt corpse with the Combat Knife impaled in its back
4 “Spooky Oozings AKA Listen” Welcome to Black Mesa: Upon falling into the pool of water immediately after entering the sewers of the Black Mesa Transit System.
5 “Spooky Monastery” "We Are Pulling Out": While riding the tram.
6 “Storm” "We Are Pulling Out": While running up to the hangar access door that The G-Man closes.
7 “Spectre of Limbo AKA Trample” "Missing In Action": While Approaching the Test Flame Area
8 “Race from Doom 2 AKA Bust” Friendly Fire: While approaching the room where Adrian first encounters the Black Ops and the Mark IV Thermonuclear Device.
9 “Temple of Limbo AKA The Beginning” Crush Depth: While entering the lift right before rescuing the Scientist in the teleporter at the beginning of the chapter.
10 “Wastes of Limbo AKA Lost in Thought Crush Depth: The room with the broken X-ray, immediately before Adrian's first encounter with Shock Troopers.
11 “Danger Rises” We Are Not Alone: Upon entering Xen for the first time.
12 “Soothing Antagonist” Foxtrot Uniform: When approaching the Dam.
13 “Stroke of Midnight AKA Run” Pit Worm's Nest: Upon dropping from the air vent at the beginning of the chapter.
14 “Open the Valve” Vicarious Reality: When Shock Troopers and Pit Drones teleport into the Observation Area of Biodome 02.
15 “Tunnel” Foxtrot Uniform: Upon entering the sewer maze populated by Voltigores.
16 “The Ticking Timebomb AKA Chamber” "The Package": Upon approaching the Black Ops Mortar.
17 “Maze” "The Package": Riding the lift leading to the start of Worlds Collide
18 "Alien Forces" Worlds Collide: While riding down the lift to the battle with the Gene Worm.
19 “Planet” This is the song played over the final credits.


Initially, the Steam releases of Opposing Force and Blue Shift had its original soundtrack replaced by that of Half-Life.

Music in the Half-Life and Portal Universe
Game soundtracks · Half-Life soundtrack · Half-Life: Opposing Force soundtrack · Half-Life: Blue Shift soundtrack ·
· Half-Life 2 soundtrack · Half-Life 2: Episode One soundtrack · Half-Life 2: Episode Two soundtrack ·
· Portal soundtrack · Portal 2 soundtrack ·
Songs · Exile Vilify · Cara Mia Addio! · Still Alive · Want You Gone ·
Real World Subjects