Half-Life 2: Episode One soundtrack

Kelly Bailey composed several pieces of original incidental music that are interspersed throughout Half-Life 2: Episode One. They are listed below. Bailey's affinity for wordplay is evident in his track titles; "Eine Kleiner Elevatormuzik" references Mozart's "Eine kleine Nachtmusik," Dr. Isaac Kleiner, and Muzak. "Penultimatum" is a portmanteau of the words "penultimate" and "ultimatum."

Using an appropriate program, it is possible to extract all audio tracks heard in-game from the "episode 1 shared.gcf" archive file. The soundtrack was also included in the game directory of both the full and demo Audiosurf releases on Steam.

Description
Opens with a harsh, siren-like sound, leading into a fast-paced beat, punctuation by discordant guitar effects. Meant to inspire unease for the player.

Location played
During a large attack by Zombines in Lowlife.

Description
An ambient track.

Location played
When entering the room with the shaft full of Advisor Pods.

Description
An odd mix of synth sounds and piano.

Location played
Chapter Urban Flight, after killing the Antlion Guard.

Description
Eerie sounding ambience.

Location played
Lowlife, when entering the ventilation shafts for the first time.

Description
A very fast-paced song. Has an odd percussion beat that plays throughout most of the song.

Location played
At the end of Lowlife, fighting Zombies and waiting for the elevator out of the underground.

Description
A quiet, ambient track. Sounds like elevator music (hence the name).

Location played
Chapter Undue Alarm, when encountering a Stalker and Rollermines.

Description
A techno-rock song.

Location played
Fighting Zombies in the Hospital in Urban Flight.

Description
Very similar to Darkness At Noon.

Location played
When entering the Citadel Core in Direct Intervention.

Description
Ambience.

Location played
When first sighting the elevator at the end of Lowlife.

Location played
Exit 17, during the final battle with the Strider