Half-Life 2 Episode One soundtrack

{{DISPLAYTITLE''Half-Life 2 Episode One'' soundtrack}}
{{Article|rw|hl2|good}}
FileHL2 Ep1 AlbumArtwork.png|thumb|right|250px|Steam album artwork.
The '''''Half-Life 2 Episode One'' soundtrack''' was composed by Kelly Bailey. It was released in part on ''The Orange Box soundtrack|The Orange Box Original Soundtrack''.

Using an appropriate program, it is possible to extract all audio tracks heard in-game from the "ep1_pak_dir.vpk" archive file. On September 24, 2014, the soundtrack was made available as http//store.steampowered.com/app/323150/ free DLC to all owners of the game on Steam.

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==Track listing==
* = not present on the ''Orange Box'' Original Soundtrack CD.

{| class="wikitable grid sortable plainlinks" width="100%" style="width 100%; text-alignleft"
|-
! class="header" width=" 5%"| Orange Box 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"| *
| valign=top width="70px"| 01
| valign=top width="80px"| ''Eine Kleiner Elevatormuzik''
| valign=top| VLVX_song1.mp3
| valign=top width="80px"| 118
| valign=top| '''''Half-Life_2_Episode_One_storyline 1 Undue Alarm|Undue Alarm''''' When looking over the ledge in the Citadel where Alyx Vance|Alyx comments "I had no idea," before encountering the Stalker|Stalkers and the Rollermine|Rollermines.
| valign=top| The title references Mozart's "WikipediaSerenade No. 13 (Mozart)|Eine kleine Nachtmusik," Dr. Isaac Kleiner, and WikipediaMuzak Holdings|Muzak.
|-
| valign=top| 07
| valign=top| 02
| valign=top| ''Combine Advisory''
| valign=top| VLVX_song2.mp3
| valign=top| 154
| valign=top| '''''Half-Life_2_Episode_One_storyline 1 Undue Alarm|Undue Alarm''''' When entering the room with the shaft full of Advisor pods.
| valign=top| 
|-
| valign=top| *
| valign=top| 03
| valign=top| ''Negative Pressure''
| valign=top| HL1_song19.mp3
| valign=top| 156
| valign=top| '''''Half-Life_2_Episode_One_storyline 1 Undue Alarm|Undue Alarm''''' When getting on the large glass elevator.
| valign=top| Also appears in ''Half-Life'' (under the name "Steam in the Pipes") and ''Half-Life 2''. 
|-
| valign=top| *
| valign=top| 04
| valign=top| ''Infraradiant''
| valign=top| VLVX_song19a.mp3
| valign=top| 438
| valign=top| '''''Half-Life_2_Episode_One_storyline 2 Direct Intervention|Direct Intervention''''' When entering the Citadel Core.
| valign=top| 
|-
| valign=top| *
| valign=top| 05
| valign=top| ''Darkness at Noon''
| valign=top| VLVX_song8.mp3
| valign=top| 056
| valign=top| '''''Half-Life_2_Episode_One_storyline 3 Lowlife|Lowlife''''' When first entering the vents where Alyx comments on being "blind as a bat."
| valign=top| 
|-
| valign=top| 05
| valign=top| 06
| valign=top| ''Disrupted Original''
| valign=top| VLVX_song11.mp3
| valign=top| 118
| valign=top| '''''Half-Life_2_Episode_One_storyline 3 Lowlife|Lowlife''''' During the first large fight with Zombine|Zombines in the tunnels.
| valign=top| This track was created as the introductory cue for a new enemy, the Zombine.''Half-Life 2 Episode One'' commentary
|-
| valign=top| *
| valign=top| 07
| valign=top| ''Decay Mode''
| valign=top| VLVX_song19b.mp3
| valign=top| 307
| valign=top| '''''Half-Life_2_Episode_One_storyline 3 Lowlife|Lowlife''''' After the lights by the elevator go out and Alyx comments on the sparking wire.
| valign=top| Also appears as the first song in the fourth ''Half-Life 2 Episode One'' launch teaser.
|-
| valign=top| *
| valign=top| 08
| valign=top| ''Self Destruction''
| valign=top| VLVX_song12.mp3
| valign=top| 200
| valign=top| '''''Half-Life_2_Episode_One_storyline 3 Lowlife|Lowlife''''' After Alyx says "here comes trouble" at the start of the Zombie|zombie battle.
| valign=top| Appears as the second song in the fourth ''Half-Life 2 Episode One'' launch teaser.
|-
| valign=top| 09
| valign=top| 09
| valign=top| ''Guard Down''
| valign=top| VLVX_song4.mp3
| valign=top| 139
| valign=top| '''''Half-Life_2_Episode_One_storyline 4 Urban Flight|Urban Flight''''' When Alyx mans the turret after killing the Antlion Guard.
| valign=top| This track is used in the third ''Half-Life 2 Episode One'' launch teaser.
|-
| valign=top| *
| valign=top| 10
| valign=top| ''What Kind of Hospital Is This?''
| valign=top| VLVX_song18.mp3
| valign=top| 305
| valign=top| '''''Half-Life_2_Episode_One_storyline 4 Urban Flight|Urban Flight''''' When Alyx gets a shotgun before entering the hall of zombies.
| valign=top| Also used in the first ''Half-Life 2 Episode One'' launch teaser. 
|-
| valign=top| *
| valign=top| 11
| valign=top| ''Penultimatum''
| valign=top| VLVX_song21.mp3
| valign=top| 250
| valign=top| '''''Half-Life_2_Episode_One_storyline 5 Exit 17|Exit 17''''' When the Strider first appears.
| valign=top| "Penultimatum" is a portmanteau of the words "penultimate" and "ultimatum." This track is used in the second ''Half-Life 2 Episode One'' launch teaser.
|-
|}

==External links==
*{{Steam|url=323150|text=Half-Life 2 Episode One Soundtrack}}

==References==
{{Reflist}}

{{RW}}
CategorySoundtracks
CategoryHalf-Life 2 Episode One