Half-Life 2 soundtrack

{{DISPLAYTITLE''Half-Life 2'' soundtrack}}
{{Article|rw|hl2|good}}
FileHL2 AlbumArtwork.png|thumb|right|250px|Steam album artwork.
The '''''Half-Life 2'' soundtrack''' was composed by Kelly Bailey. It is an amalgamation of newly-composed music and several cues from Bailey's previous work on ''Half-Life''. Most, if not all, of the tracks were named by Marc Laidlaw.http//forums.steampowered.com/forums/showpost.php?p=34592769&postcount=128 Marc Laidlaw as quoted in the ''Marc Laidlaw Vault'' on the Steam Users' Forums

The limited edition ''Half-Life 2'' "Gold" package included, among other exclusive extras, a CD soundtrack. Although the CD contains several exclusive tracks, it does not include all of the music heard in the game. Using an appropriate program, it is possible to extract all audio tracks heard in-game from the hl2_sound_misc_dir.vpk archive file. The soundtrack (save the CD versions of tracks 1 and 34) was also included in the game directory of both the full and demo ''WikipediaAudiosurf|Audiosurf'' releases on WikipediaSteam (software)|Steam. On September 24, 2014, the soundtrack was made available as http//store.steampowered.com/app/323140 free DLC to all owners of the game on Steam.

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==Track listing==
* = not present on the ''Half-Life 2'' Original Soundtrack CD.

** = not present in ''Half-Life 2'' game files.
{| class="wikitable grid sortable plainlinks" width="100%" style="width 100%; text-alignleft"
|-
! class="header" width=" 5%"| OST #
! class="header" width=" 5%"| Game #
! class="header" | Track title
! class="header" | Filename
! class="header" width=" 5%"| Time
! class="header unsortable" | Level location
! class="header unsortable" | Comments
|-
| valign=top width="70px"| 01
| valign=top width="70px"| **
| valign=top width="80px"| ''Hazardous Environments'' (long version)
| valign=top| Half-Life13.mp3
| valign=top width="80px"| 123
| valign=top| ''Does not appear in the retail game''
| valign=top| This is the Valve Corporation theme song, the beginning of which is played during the Valve logo movie in all Valve games. This track appears in its complete form in ''Half-Life soundtrack|Half-Life'' during the chapter ''Half-Life storyline Tension|Surface Tension''. In ''Half-Life 2'', only the edited versions in the opening logo and "Hazardous Environments (short version)" are heard, though the complete track is on the original soundtrack CD. This is the same track as "Valve Theme (Long Version)" from ''Half-Life''.
|-
| valign=top| *
| valign=top| 05
| valign=top| ''Hazardous Environments'' (short version)
| valign=top| HL1_song11.mp3
| valign=top| 035
| valign=top| '''''Half-Life 2 storyline 2 .22A Red Letter Day.22|A Red Letter Day''''' when Gordon puts on the HEV suit in Dr. Kleiner's lab.
| valign=top| This is a shorter edit of "Hazardous Environments," the Valve Theme, removing the first few seconds of the long version, concluding before further percussion can begin.
|-
| valign=top| 02
| valign=top| 10
| valign=top| ''CP Violation''
| valign=top| HL2_song20_submix0.mp3
| valign=top| 143
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' Early in the level in a train tunnel that has the player moving through side passages.
| valign=top| "CP Violation" is a double entendre, referring to both Civil Protection and WikipediaCP violation|the eponymous physics term.
|-
| valign=top| *
| valign=top| 13
| valign=top| ''CP Violation'' (remix)
| valign=top| HL2_song20_submix4.mp3
| valign=top| 220
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' Upon leaving the pool with a mixer in it, where Civil Protection rolls explosive barrels at the player.
|
|-
| valign=top| 03
| valign=top| 12, 42
| valign=top| ''The Innsbruck Experiment''
| valign=top| HL2_song4.mp3
| valign=top| 106
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' when first fighting Submachine Gun (Half-Life 2)|Submachine Gun-wielding Metrocops. {{C|first instance}}
'''''Anticitizen One''''' When Dog shows off his strength during a fight with Civil Protection. {{C|second instance}}
| valign=top| This track was used in the 2004 ''Half-Life 2'' trailer. On console versions of ''The Orange Box'', this is played when highlighting ''Half-Life 2'' on the menu. See http//www.scientificamerican.com/article.cfm?id=quotbeam-me-upquot "Beam Me Up" for more information on the name.
|-
| valign=top| 04
| valign=top| 48
| valign=top| ''Brane Scan''
| valign=top| HL2_song31.mp3
| valign=top| 141
| valign=top| '''''Half-Life 2 storyline 10 Anticitizen One|Anticitizen One''''' Leading up to the fight in the plaza containing the Combine Power Generator|Combine generator.
| valign=top| 
|-
| valign=top| 05
| valign=top| 27, 62
| valign=top| ''Dark Energy''
| valign=top| HL2_song3.mp3
| valign=top| 133
| valign=top| '''''Half-Life 2 storyline 7 Highway 17|Highway 17''''' Played when leaving Shorepoint Base.
'''''Credits''''' Played during the first section.
| valign=top| The very ending contains a snippet of "Highway 17."
|-
| valign=top| 06
| valign=top| 24
| valign=top| ''Requiem For Ravenholm''
| valign=top| Ravenholm_1.mp3
| valign=top| 033
| valign=top| '''''Half-Life 2 storyline 6 "We Don't Go To Ravenholm..."|"We Don't Go To Ravenholm..."''''' After passing through the gate at the end of the courtyard and Father Grigori bids farewell, the song plays.
| valign=top| The "Ravenholm Reprise" track, only shortened and centering around a loud guitar wail.
|-
| valign=top| 07
| valign=top| **
| valign=top| ''Pulse Phase'' (OST mix)
| valign=top| HL2_song5.mp3
| valign=top| 107
| valign=top| ''Does not appear in the retail game''
| valign=top| This version appears in the original soundtrack CD and in ''AudioSurf'', as well as the Development of Half-Life 2 game|2003 ''Half-Life 2'' leak, but not in the retail version of the game.
|-
| valign=top| *
| valign=top| 52, 61
| valign=top| ''Pulse Phase'' (game mix)
| valign=top| HL2_song6.mp3
| valign=top| 045
| valign=top| '''''Half-Life 2 storyline 11 "Follow Freeman!"|"Follow Freeman!"''''' As the player enters the Strider battle just outside the Overwatch Nexus. {{C|first instance}}
'''''Half-Life 2 storyline 13 Dark Energy|Dark Energy''''' When the player is descending in the elevator to face Wallace Breen|Breen. {{C|second instance}}
| valign=top| This is the in-game version of the track, which is the looped version played four times in a row.
|-
| valign=top| **
| valign=top| **
| valign=top| ''Pulse Phase'' (loop)
| valign=top| HL2_song6.wav
| valign=top| 011
| valign=top| ''Does not appear in the retail game''
| valign=top| This version only appears in the leak.
|-
| valign=top| 08
| valign=top| 23
| valign=top| ''Ravenholm Reprise''
| valign=top| HL2_song7.mp3
| valign=top| 050
| valign=top| '''''Half-Life 2 storyline 6 "We Don't Go To Ravenholm..."|"We Don't Go To Ravenholm..."''''' Starts playing as soon as the level begins.
| valign=top| 
|-
| valign=top| 09
| valign=top| 16
| valign=top| ''Probably Not a Problem''
| valign=top| HL2_song33.mp3
| valign=top| 124
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' During the Headcrab Headcrab Shell|shelling around the toxic water, before getting the airboat.
| valign=top| 
|-
| valign=top| 10
| valign=top| 36, 49
| valign=top| ''Calabi-Yau Model''
| valign=top| HL2_song30.mp3
| valign=top| 146
| valign=top| '''''Half-Life 2 storyline 8 Sandtraps|Sandtraps''''' Upon entering the Vortigaunt Camp after killing the Antlion Guardian. {{C|first instance}}
'''''Half-Life 2 storyline 11 "Follow Freeman!"|"Follow Freeman!"''''' Plays near the start of the level when entering the Zombie-infested building. {{C|second instance}}
| valign=top| 
|-
| valign=top| 11
| valign=top| 28
| valign=top| ''Slow Light''
| valign=top| HL2_song32.mp3
| valign=top| 045
| valign=top| '''''Half-Life 2 storyline 7 Highway 17|Highway 17''''' Plays after the Combine Gunship|Gunship in New Little Odessa has been defeated.
| valign=top| 
|-
| valign=top| 12
| valign=top| 07, 37
| valign=top| ''Apprehension and Evasion''
| valign=top| HL2_song29.mp3
| valign=top| 218
| valign=top| '''''Half-Life 2 storyline 2 "A Red Letter Day"|"A Red Letter Day"''''' While escaping from Civil Protection through the train tracks. {{C|first instance}}
'''''Half-Life 2 storyline 8 Sandtraps|Sandtraps''''' During the night time raid on Nova Prospekt (the bunker raiding section). {{C|second instance}}
| valign=top| 
|-
| valign=top| 13
| valign=top| 54
| valign=top| ''Hunter Down''
| valign=top| HL2_song28.mp3
| valign=top| 013
| valign=top| '''''Half-Life 2 storyline 11 "Follow Freeman!"|"Follow Freeman!"''''' Played immediately after the last Strider is killed.
| valign=top| 
|-
| valign=top| 14
| valign=top| 06
| valign=top| ''Our Resurrected Teleport''
| valign=top| HL2_song26.mp3
| valign=top| 112
| valign=top| '''''Half-Life 2 storyline 2 "A Red Letter Day"|"A Red Letter Day"''''' The Teleportation|teleport room in Isaac Kleiner|Dr. Kleiner's laboratory
| valign=top| 
|-
| valign=top| 15
| valign=top| *
| valign=top| ''Miscount Detected''
| valign=top| HL2_song25_Teleport.mp3
| valign=top| 048
| valign=top| ''Does not appear in the retail game''
| valign=top| Appears in the game files, ''AudioSurf'', and the original soundtrack CD, but nowhere in-game. It was supposed to play during the aborted teleport sequence in ''Half-Life 2 storyline 2 "A Red Letter Day"|"A Red Letter Day"''.
|-
| valign=top| 16
| valign=top| **
| valign=top| ''Headhumper''
| valign=top| HL2_song24_Lamar.mp3
| valign=top| 008
| valign=top| ''Does not appear in the retail game''
| valign=top| A bonus track on the original soundtrack CD and in ''AudioSurf''. Was originally supposed to play when the player is ambushed by a Headcrab while exploring a zombie-infested shack during ''Half-Life 2 storyline 4 Water Hazard|Water Hazard.''
|-
| valign=top| 17
| valign=top| 26
| valign=top| ''Triage at Dawn''
| valign=top| HL2_song23_SuitSong3.mp3
| valign=top| 045
| valign=top| '''''Half-Life 2 storyline 6 "We Don't Go To Ravenholm..."|"We Don't Go To Ravenholm..."''''' At Shorepoint Base, when the battle in the garage is over.
| valign=top| The name is a reference to the the very situation the player finds himself at the point it is played - WikipediaTriage|Triage of List of minor Resistance members at dawn break.
|-
| valign=top| 18
| valign=top| **
| valign=top| ''Combine Harvester''
| valign=top| HL2_song22_CombineTheme3.mp3
| valign=top| 123
| valign=top| ''Does not appear in the retail game''
| valign=top| A bonus track on the original soundtrack CD and ''AudioSurf''. Was originally supposed to play somewhere in the Citadel.An entry for "hl2_song22_combineTheme3" appears in level_sounds_citadel.txt. The title is a reference to the WikipediaCombine harvester|combine harvester, a farming machine that harvests grain crops.
|-
| valign=top| 19
| valign=top| 30, 41
| valign=top| ''Lab Practicum''
| valign=top| HL2_song2.mp3
| valign=top| 252
| valign=top| '''''Half-Life 2 storyline 7 Highway 17|Highway 17''''' Under the train bridge.
'''''Half-Life 2 storyline 9a Entanglement|Entanglement''''' After exiting the teporter in Dr. Kleiner's lab, just before the beginning of ''Half-Life 2 storyline 10 Anticitizen One|Anticitizen One''.
| valign=top| A longer version of "Shadows Fore and Aft" without the extra sound effects.
|-
| valign=top| 20
| valign=top| 37
| valign=top| ''Nova Prospekt''
| valign=top| HL2_song19.mp3
| valign=top| 155
| valign=top| '''''Half-Life 2 storyline 9 Nova Prospekt|Nova Prospekt''''' When the player initially enters the prison.
| valign=top| A subtle refrain from "CP Violation" can be heard at 100 for around twenty seconds before dropping to a more dramatic outro. 
|-
| valign=top| 21
| valign=top| 15
| valign=top| ''Broken Symmetry''
| valign=top| HL2_song17.mp3
| valign=top| 103
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' Upon leaving the sewers.
| valign=top| 
|-
| valign=top| 22
| valign=top| 53
| valign=top| ''LG Orbifold''
| valign=top| HL2_song16.mp3
| valign=top| 252
| valign=top| '''''Half-Life 2 storyline 11 "Follow Freeman!"|"Follow Freeman!"''''' When the player and other citizens go underground and fight Combine soldiers during the Uprising.
| valign=top| 
|-
| valign=top| 23
| valign=top| 51
| valign=top| ''Kaon''
| valign=top| HL2_song15.mp3
| valign=top| 111
| valign=top| '''''Half-Life 2 storyline 11 "Follow Freeman!"|"Follow Freeman!"''''' When fighting the Combine Gunship over the Overwatch Nexus.
| valign=top| 
|-
| valign=top| 24
| valign=top| 19
| valign=top| ''You're Not Supposed to Be Here''
| valign=top| HL2_song14.mp3
| valign=top| 241
| valign=top| '''''Half-Life 2 storyline 4 Water Hazard|Water Hazard''''' After receiving the mounted gun for the Airboat.
| valign=top| The title is a reference to a line the G-Man said to the player in a cut training level of ''Half-Life 2'' that can be found in the ''Half-Life 2'' leak. The G-Man uses the line again, this time directed at Alyx, in a trailer for ''Half-Life 2 Episode Two''.
|-
| valign=top| 25
| valign=top| 44
| valign=top| ''Suppression Field''
| valign=top| HL2_song13.mp3
| valign=top| 056
| valign=top| '''''Half-Life 2 storyline 10 Anticitizen One|Anticitizen One''''' While meeting your first Resistance|rebel squad member of the chapter in the playground.
| valign=top| 
|-
| valign=top| 26
| valign=top| 45, 46
| valign=top| ''Hard Fought'' (long)
| valign=top| HL2_song12_long.mp3 HL2_song12d.mp3
| valign=top| 113
| valign=top| '''''Half-Life 2 storyline 10 Anticitizen One|Anticitizen One''''' Played twice in a row first when assaulting a Civil Protection barricade, and then during the underground shootout while waiting for a hole to be blown open by a rebel.
| valign=top| Several versions of this track exist, including an early version from the ''Half-Life 2'' leak and a short version. This version is the one used in the retail game. This track also appears in the ''Half-Life 2 Episode One'' trailer.
|-
| valign=top| *
| valign=top| **
| valign=top| ''Hard Fought'' (short)
| valign=top| HL2_song12_short.mp3 HL2_song12c.mp3
| valign=top| 044
| valign=top| ''Does not appear in the retail game''
| valign=top| This version only appears in ''AudioSurf'' and the ''Half-Life 2'' leak.
|-
| valign=top| *
| valign=top| **
| valign=top| ''Hard Fought'' (early version)
| valign=top| HL2_song12.mp3
| valign=top| 044
| valign=top| ''Does not appear in the retail game''
| valign=top| This version only appears the ''Half-Life 2'' leak.
|-
| valign=top| 27
| valign=top| 25
| valign=top| ''Particle Ghost''
| valign=top| HL2_song1.mp3
| valign=top| 138
| valign=top| '''''Half-Life 2 storyline 6 "We Don't Go To Ravenholm..."|"We Don't Go To Ravenholm..."''''' Kicks in upon leaving the Ravenholm Mines and heading into the Overwatch Sniper|snipers' nests outside, right before the Fast Zombie appears.
| valign=top| 
|-
| valign=top| 28
| valign=top| 01
| valign=top| ''Shadows Fore and Aft''
| valign=top| HL2_intro.mp3
| valign=top| 125
| valign=top| '''''Half-Life 2 storyline 1 Point Insertion|Point Insertion''''' During the G-Man's speech at the start of the game.
| valign=top| This is shorter version of "Lab Practicum" with added sound effects. The whirring of Manhack blades and Kleiner's teleport can be heard in the background.
|-
| valign=top| 29
| valign=top| 55
| valign=top| ''Neutrino Trap''
| valign=top| HL1_song9.mp3
| valign=top| 135
| valign=top| '''''Half-Life 2 storyline 12 Our Benefactors|Our Benefactors''''' Upon exiting the sewer tunnel at the base of the Citadel.
| valign=top| This is the same track as "Hurricane Strings" from ''Half-Life''.
|-
| valign=top| 30
| valign=top| 11
| valign=top| ''Zero Point Energy Field''
| valign=top| HL1_song6.mp3
| valign=top| 142
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' When first entering the sewers after the Hunter-Chopper first attacks.
| valign=top| This is the same track as "Cavern Ambiance" from ''Half-Life''.
|-
| valign=top| 31
| valign=top| 47, 56
| valign=top| ''Echoes of a Resonance Cascade''
| valign=top| HL1_song5.mp3
| valign=top| 138
| valign=top| '''''Half-Life 2 storyline 10 Anticitizen One|Anticitizen One''''' Upon entering the underground hazardous liquid cavern with the cars. {{C|first instance}}
'''''Half-Life 2 storyline 12 Our Benefactors|Our Benefactors''''' While Freeman is in the Combine Cell|prisoner pod, moving through the Citadel. {{C|second instance}}
| valign=top| This is the same track as "Space Ocean" from ''Half-Life''.
|-
| valign=top| 32
| valign=top| 22
| valign=top| ''Black Mesa Inbound''
| valign=top| HL1_song3.mp3
| valign=top| 214
| valign=top| '''''Half-Life 2 storyline 5 Black Mesa East|Black Mesa East''''' The scrapyard where you first receive the Gravity Gun and meet Dog.
| valign=top| The name is derived from the first level of ''Half-Life'', in which the player is making his way to the Black Mesa Research Facility C Test Labs and Control Facilities|Anomalous Materials Lab. This is the same track as "Vague Voices" from ''Half-Life''.
|-
| valign=top| 33
| valign=top| 60
| valign=top| ''Xen Relay''
| valign=top| HL1_song26.mp3
| valign=top| 040
| valign=top| '''''Half-Life 2 storyline 13 Dark Energy|Dark Energy''''' Upon reaching the top of the Citadel, just before meeting Wallace Breen|Dr. Breen.
| valign=top| This is the same track as "Threatening Short" from ''Half-Life''.
|-
| valign=top| 34
| valign=top| **
| valign=top| ''Tracking Device'' (OST mix)
| valign=top| HL1_song25.mp3
| valign=top| 103
| valign=top| ''Does not appear in the retail game''
| valign=top| This is a remix of "Credits/Closing Theme" from ''Half-Life''. This version only appears on the original soundtrack CD.
|-
| valign=top| *
| valign=top| 63
| valign=top| ''Tracking Device'' (game mix)
| valign=top| HL1_song25_REMIX3.mp3
| valign=top| 101
| valign=top| '''''Credits''''' Played during the second section.
| valign=top| This version only appears in the ''Half-Life 2'' game files and ''Audiosurf''.
|-
| valign=top| 35
| valign=top| 41
| valign=top| ''Singularity''
| valign=top| HL1_song24.mp3
| valign=top| 119
| valign=top| '''''Half-Life 2 storyline 9a Entanglement|Entanglement''''' When viewing the Nova Prospekt Teleportation|teleport.
| valign=top| This is the same track as "Traveling Through Limbo" from ''Half-Life''.
|-
| valign=top| 36
| valign=top| 40
| valign=top| ''Dirac Shore''
| valign=top| HL1_song21.mp3
| valign=top| 127
| valign=top| '''''Half-Life 2 storyline 9a Entanglement|Entanglement''''' When entering the flooded basement.
| valign=top| Its name is a play on the physics term WikipediaDirac Sea|Dirac Sea. This is the same track as "Dimensionless Deepness" from ''Half-Life''.
|-
| valign=top| 37
| valign=top| 21
| valign=top| ''Escape Array''
| valign=top| HL1_song20.mp3
| valign=top| 127
| valign=top| '''''Half-Life 2 storyline 5 Black Mesa East|Black Mesa East''''' At the start of the level, right after the loading screen.
| valign=top| This is the same track as "Electric Guitar Ambiance" from ''Half-Life''.
|-
| valign=top| 38
| valign=top| 58
| valign=top| ''Negative Pressure''
| valign=top| HL1_song19.mp3
| valign=top| 158
| valign=top| '''''Half-Life 2 storyline 12 Our Benefactors|Our Benefactors''''' At the beginning of Wallace Breen|Dr. Breen's speech "You have destroyed so much. What is it exactly that you have created?"
| valign=top| This is the same track as "Steam In The Pipes" from ''Half-Life''. This track also appears in ''Half-Life 2 Episode One''.
|-
| valign=top| 39
| valign=top| 29
| valign=top| ''Tau-9''
| valign=top| HL1_song17.mp3
| valign=top| 206
| valign=top| '''''Half-Life 2 storyline 7 Highway 17|Highway 17''''' When first reaching the crane.
| valign=top| This is the same track as "Drums and Riffs" from ''Half-Life''.
|-
| valign=top| 40
| valign=top| 33
| valign=top| ''Something Secret Steers Us''
| valign=top| HL1_song15.mp3
| valign=top| 203
| valign=top| '''''Half-Life 2 storyline 8 Sandtraps|Sandtraps''''' At Lighthouse Point during the Combine Dropship|Dropship attack.
| valign=top| This is the same track as "Nuclear Mission Jam" from ''Half-Life''. The title is a reference to a Vortigaunt#In English|sentence said by the All-Knowing Vortigaunt.
|-
| valign=top| 41
| valign=top| 49
| valign=top| ''Triple Entanglement''
| valign=top| HL1_song14.mp3
| valign=top| 132
| valign=top| '''''Half-Life 2 storyline 10 Anticitizen One|Anticitizen One''''' Upon entering the Zombie infested sewers near the end of the chapter.
| valign=top| This is a remix of "Sirens in the Distance" from ''Half-Life''.
|-
| valign=top| 42
| valign=top| **
| valign=top| ''Biozeminade Fragment''
| valign=top| HL1_song13.mp3
| valign=top| 032
| valign=top| ''Does not appear in the retail game''
| valign=top| A bonus track on the original soundtrack CD, though it does not appear in the retail game files or ''AudioSurf''. This is a remix of "Alien Shock" from ''Half-Life''. The name is an homage to an early Amazon.com joke review for ''Half-Life 2'' in which a fan claimed the game had Biozeminades in it.http//web.archive.org/web/20051122202731/http//home.comcast.net/~shuzer/biozeminades.jpg ''Half-Life 2'', Customer Review on Amazon.com (August 2, 2003)
|-
| valign=top| 43
| valign=top| 18
| valign=top| ''Lambda Core''
| valign=top| HL1_song10.mp3
| valign=top| 145
| valign=top| '''''Half-Life 2 storyline 4 Water Hazard|Water Hazard''''' When fleeing from the second Hunter-Chopper while driving through large cement pipes.
| valign=top| This is the same track as "Diabolical Adrenaline Guitar" from ''Half-Life''.
|-
| valign=top| *
| valign=top| 38
| valign=top| ''Entanglement''
| valign=top| HL2_song0.mp3
| valign=top| 039
| valign=top|'''''Half-Life 2 storyline 9 Nova Prospekt|Nova Prospekt''''' Upon entering the Combine Wall crushing canyon at end of chapter, just before meeting Alyx.
| valign=top| This track only appears in the ''Half-Life 2'' game files.
|-
| valign=top| *
| valign=top| 09
| valign=top| ''Entanglement'' (loop)
| valign=top| HL2_ambient_1.wav
| valign=top| 008
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' When exiting the first underground section, before climbing on top of the moving train.
| valign=top| This track only appears in the ''Half-Life 2'' game files. Was originally only in the leak until the June 2013 SteamPipe update. It is the only track to play as an ambient sound.
|-
| valign=top| *
| valign=top| 32
| valign=top| ''Highway 17''
| valign=top| HL2_song8.mp3
| valign=top| 059
| valign=top| '''''Half-Life 2 storyline 8 Sandtraps|Sandtraps''''' At the house by the coast where Combine soldiers are burning bodies.
| valign=top| This song is actually the looped version played four times in a row.
|-
| valign=top| *
| valign=top| **
| valign=top| ''Highway 17'' (loop)
| valign=top| HL2_song8.wav
| valign=top| 015
| valign=top| ''Does not appear in the retail game''
| valign=top| This version only appears in the leak.
|-
| valign=top| *
| valign=top| 04
| valign=top| ''A Red Letter Day''
| valign=top| HL2_song10.mp3
| valign=top| 029
| valign=top| '''''Half-Life 2 storyline 2 "A Red Letter Day"|"A Red Letter Day"''''' When entering Dr. Kleiner's lab.
| valign=top| 
|-
| valign=top| *
| valign=top| 31
| valign=top| ''Sandtraps''
| valign=top| HL2_song11.mp3
| valign=top| 034
| valign=top| '''''Half-Life 2 storyline 8 Sandtraps|Sandtraps''''' At the zombie-infested area of the tunnels.
| valign=top| Also known by the filename 31_56_01.AIF. Was originally supposed to have an earlier appearance in Route Kanal, during the first Barnacle encounter, right before Civil Protection executes a group of rebels.
|-
| valign=top| *
| valign=top| 02
| valign=top| ''Train Station 1''
| valign=top| HL2_song26_trainstation1.mp3
| valign=top| 130
| valign=top| '''''Half-Life 2 storyline 1 Point Insertion|Point Insertion''''' When entering the outdoor plaza with the Breencast.
| valign=top| 
|-
| valign=top| *
| valign=top| 03, 50
| valign=top| ''Train Station 2''
| valign=top| HL2_song27_trainstation2.mp3
| valign=top| 112
| valign=top| '''''Half-Life 2 storyline 1 Point Insertion|Point Insertion''''' When running on the rooftops from Civil Protection. {{C|first instance}}
'''''Half-Life 2 storyline 11 "Follow Freeman!"|"Follow Freeman!"''''' When entering the lobby in the Overwatch Nexus with Barney. {{C|second instance}}
| valign=top| 
|-
| valign=top| *
| valign=top| 43
| valign=top| ''Radio''
| valign=top| radio1.mp3
| valign=top| 039
| valign=top| '''''Half-Life 2 storyline 10 Anticitizen One|Anticitizen One''''' When entering the room adjacent to the closet with the TV showing the G-Man.
| valign=top| 
|-
| valign=top| *
| valign=top| 17, 57
| valign=top| ''Industrial Suspense 1''
| valign=top| industrial_suspense1.wav
| valign=top| 012
| valign=top| '''''Half-Life 2 storyline 4 Water Hazard|Water Hazard''''' In the beginning of the chapter, upon seeing a citizen dropping supply crates from a bridge. {{C|first instance}}
'''''Half-Life 2 storyline 12 Our Benefactors|Our Benefactors''''' Right after Dr. Breen's "I am nothing if not pragmatic" speech. {{C|second instance}}
| valign=top| This track also appears in ''Half-Life 2 Episode Two''.
|-
| valign=top| *
| valign=top| 59
| valign=top| ''Industrial Suspense 2''
| valign=top| industrial_suspense2.wav
| valign=top| 011
| valign=top| '''''Half-Life 2 storyline 12 Our Benefactors|Our Benefactors''''' After Dr. Breen's "laying the foundation for humanity" speech and jumping down, before the Strider battle.
| valign=top| 
|-
| valign=top| *
| valign=top| 39
| valign=top| ''Apprehensive Short''
| valign=top| HL1_stinger_song7.mp3
| valign=top| 023
| valign=top| '''''Half-Life 2 storyline 9a Entanglement|Entanglement''''' When Eli's Combine pod opens up at the window with Alyx and the player.
| valign=top| This track also appears in ''Half-Life''.
|-
| valign=top| *
| valign=top| 08
| valign=top| ''Bass String Short''
| valign=top| HL1_stinger_song8.mp3
| valign=top| 009
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' When Civil Protection is beating up the couple, right before the player gets the pistol.
| valign=top| This track also appears in ''Half-Life''.
|-
| valign=top| *
| valign=top| 34
| valign=top| ''Scared Confusion Short''
| valign=top| HL1_stinger_song16.mp3
| valign=top| 016
| valign=top| '''''Half-Life 2 storyline 8 Sandtraps|Sandtraps''''' Right before the Antlion Guard battle outside the Vortigaunt camp.
| valign=top| This track also appears in ''Half-Life''.
|-
| valign=top| *
| valign=top| 14
| valign=top| ''Dark Piano Short''
| valign=top| HL1_stinger_song27.mp3
| valign=top| 017
| valign=top| '''''Half-Life 2 storyline 3 Route Kanal|Route Kanal''''' When entering the room full of explosive barrels and Manhacks.
| valign=top| This track also appears in ''Half-Life''.
|-
| valign=top| *
| valign=top| 20, 35
| valign=top| ''Sharp Fear Short''
| valign=top| HL1_stinger_song28.mp3
| valign=top| 007
| valign=top| '''''Half-Life 2 storyline 4 Water Hazard|Water Hazard''''' When the Hunter-Chopper is destroyed. {{C|first instance}}
'''''Half-Life 2 storyline 8 Sandtraps|Sandtraps''''' When the Antlion guard emerges outside the Vortigaunt camp. {{C|second instance}}
| valign=top| This track also appears in ''Half-Life'' as well as the ''Half-Life 2 Episode One'' trailer.
|-
|}

==External links==
*{{Steam|url=323140|text=Half-Life 2 Soundtrack}}

==References==
{{Reflist}}

{{RW}}

CategorySoundtracks
CategoryHalf-Life 2