Half-Life 2: Episode One soundtrack
Using an appropriate program, it is possible to extract all audio tracks heard in-game from the "
ep1_pak_dir.vpk" archive file. The soundtrack was also included in the game directory of both the full and demo Audiosurf releases on Steam as part of Audiosurf's The Orange Box Soundtrack. On September 24, 2014, the soundtrack was made available as free DLC to all owners of the game on Steam.
* = not present in a given soundtrack.
|The Orange Box OST #||Game #||OST (Steam DLC) #||Track title||Filename||Time||Level location||Comments|
|*||01||06||Eine Kleiner Elevatormuzik||
||1:18||Undue Alarm: When looking over the ledge in the Citadel where Alyx comments "I had no idea," before encountering the Stalkers and the Rollermines.||The title references Mozart's "Eine kleine Nachtmusik," Dr. Isaac Kleiner, and Muzak.|
||1:54||Undue Alarm: When entering the room with the shaft full of Advisor pods.|
||1:56||Undue Alarm: When getting on the large glass elevator.||Also appears in Half-Life (under the name "Steam in the Pipes") and Half-Life 2.|
||4:38||Direct Intervention: When entering the Citadel Core.|
|*||05||04||Darkness at Noon||
||0:56||Lowlife: When first entering the vents where Alyx comments on being "blind as a bat."|
||1:18||Lowlife: During the first large fight with Zombines in the tunnels.||This track was created as the introductory cue for a new enemy, the Zombine. It features the "Short Guitar Hero Lick 2" audio sample included in the album Cuckooland Asylum of Zero-G's Altered States sample library.|
||3:07||Lowlife: After the lights by the elevator go out and Alyx comments on the sparking wire.||Also appears as the first song in the fourth Half-Life 2: Episode One launch teaser.|
||2:00||Lowlife: After Alyx says "here comes trouble" at the start of the zombie battle.||Appears as the second song in the fourth Half-Life 2: Episode One launch teaser.|
||1:39||Urban Flight: When Alyx mans the turret after killing the Antlion Guard.||This track is used in the third Half-Life 2: Episode One launch teaser.|
|*||10||07||What Kind of Hospital Is This?||
||3:05||Urban Flight: When Alyx gets a shotgun before entering the hall of zombies.||Also used in the first Half-Life 2: Episode One launch teaser.|
||2:50||Exit 17: When the Strider first appears.||"Penultimatum" is a portmanteau of the words "penultimate" and "ultimatum." This track is used in the second Half-Life 2: Episode One launch teaser.|
- Half-Life 2: Episode One commentary