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The Half-Life soundtrack was composed by Kelly Bailey.[1] It is available on Steam as free DLC for all Half-Life owners.

Track list

# Title Length Location played
1 Adrenaline Horror 02:11 "We've Got Hostiles": when Gordon encounters the first Osprey and a squad of HECU soldiers.
2 Vague Voices 02:13 Black Mesa Inbound: during the tram ride to Sector C.
3 Klaxon Beat 01:02 Anomalous Materials: when Gordon acquires the HEV Suit.
4 Space Ocean 01:38 Unforeseen Consequences: as Gordon wakes up after the Resonance Cascade.
5 Cavern Ambience 01:41 Unforeseen Consequences: while descending on a platform as Headcrabs come out of a vent above.

Lambda Core: while descending on a platform with a truck, prior to fighting the Black Ops.

6 Apprehensive Short 00:25 Unforeseen Consequences: when seeing the Zombie in the dark room seated in front of a flashing monitor.

Office Complex: while exiting the elevator and seeing a live wire blocking the path.
Apprehension: when encountering the first Ichthyosaur.
"Forget About Freeman!": in the sewers, when approaching an Ichthyosaur.

7 Bass String Short 00:10 Office Complex: in a room with a boarded up exit and Headcrabs falling from the roof.

Apprehension: upon entering the freezer area.

8 Hurricane Strings 01:35 Office Complex: within the freezer area.
9 Diabolical Adrenaline Guitar 01:46 "We've Got Hostiles": immediately after the first encounter with the HECU.

Surface Tension: During the battle with the HECU and a Tank directly after climbing the cliffs.

10 Valve Theme (Extended) 01:24 Surface Tension: as Gordon crosses the cliffside area.
11 Nepal Monastery 02:10 Blast Pit: when entering the Silo and hearing the Tentacles for the first time.

Surface Tension: when nearing the tentacle in the sand.

12 Alien Shock 00:38 Power Up: upon seeing the first Gargantua.

Surface Tension: when encountering the Gargantua in the parking garage.

13 Sirens In The Distance 01:14 On A Rail: when Gordon descends into the tunnels.
14 Nuclear Mission Jam 02:02 Questionable Ethics: when picking up the Tau Cannon.
15 Scared Confusion Short 00:18 Apprehension: while witnessing the first Ichthyosaur, and while seeing a security guard get shot by Black Ops.

Lambda Core: upon entering the room with the Black Ops.
Endgame: after declining the G-Man's offer.

16 Drums and Riffs 02:05 On A Rail: right after launching the Rocket.
17 Hard Technology Rock 01:42 "Forget About Freeman!": during the battle between the Alien Grunts and HECU soldiers.
18 Steam In The Pipes 01:57 Lambda Core: when opening the portal to Xen.
19 Electric Guitar Ambiance 01:26 Surface Tension: in the area with Laser Tripmines and a Sniper.
20 Dimensionless Deepness 01:26 Xen: in the first teleporter room leading to Gonarch's lair.
21 Military Precision 01:22 Residue Processing: after meeting up with a security guard.
22 Jungle Drums 01:51 Gonarch's Lair: when Gordon fights the Gonarch.
23 Traveling Through Limbo 01:19 Nihilanth: while fighting the Nihilanth.
24 Credits / Closing Theme 01:41 Endgame: during the credits.
25 Threatening Short 00:39 Xen: after arriving Xen; and at the portal leading to the Nihilanth's chamber.
26 Dark Piano Short 00:19 Questionable Ethics: when Gordon finds an Alien Grunt confined in a glass tube.

Surface Tension: in the core of the missile storage room.

27 Sharp Fear Short 00:10 Power Up: after Gordon kills the Gargantua.


  • In several pre-release videos of Half-Life, a different version of Diabolical Adrenaline Guitar can be heard. It was likely changed in Summer 1998, as the old version can be heard in the E3 1998 Gruntfight video[2] but is not present in Half-Life: Day One.
  • Vague Voices, Steam In The Pipes, Traveling Through Limbo, Dimensionless Deepness, and Threatening Short all have the name "Prospero" in the game files, implying they were originally to be used in one of Valve's canceled games, Prospero.
  • Several tracks are composed of licensed or stock "samples", a notable example being the Methods of Mayhem Industrial Toolkit sample pack by Sony that was used by Kelly Bailey for most of the soundtrack. Due to the sample pack being publicly available (at the time), some of the same samples can often be heard in other games or even movies. An example is the drumbeat sample used in Hard Technology Rock, which can also be heard in the track Crush from the Command & Conquer Red Alert soundtrack.


  1. Ia icon The Valve team on Valve's Official Website (April 14, 2010) (Archived)
  2. YouTube favicon Half-Life - E3 1998 - Gruntfight on YouTube

External links

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
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