Portal 2 soundtrack

	Warning! This article has yet to be cleaned up to a higher standard of quality, per our Cleanup Project. It may contain factual errors and nonsense, as well as spelling, grammar and structure issues, or simply structure problems. Reader's discretion is advised until fixing is done.
	You can help clean up this page by correcting spelling and grammar, removing factual errors and rewriting sections to ensure they are clear and concise, and moving some elements when appropriate. Please notify the administrators before removing this template.

Cover art for Portal 2 Soundtrack: Songs to Test By, as given with downloadable soundtrack, featuring concept art of Chell facing GLaDOS, with the bird flying on the right of GLaDOS' head.

The Portal 2 soundtrack was composed by Mike Morasky (credited in the soundtracks as "Aperture Science Psychoacoustic Laboratories"), with the exception of the songs "Want You Gone" composed by Jonathan Coulton, "Offering," composed by Larry Stephens, an arrangement of Little Prelude in C minor, BWV 934 by Johann Sebastian Bach, and "Exile Vilify," composed by The National.

The soundtrack is marketed as "aural stimulus" released for free on MP3 over the course of mid-2011, alongside ringtone versions for the Android and the iPhone.

A Collector's Edition of the soundtrack has been released in October 30, 2012 which includes a fourth volume containing the Portal soundtrack.

While the music can be found in the game files, most tracks are unmixed stems and can only be fully experienced in-game, as most of the time the testing elements provide additional musical tones. Mixing in-game is usually sequential or layered samples, the latter being mostly looped. The soundtrack is largely electronic and differs from the quiet ambient music used in the Portal soundtrack in that it is often upbeat.

On September 24, 2014, the soundtrack was made available on Steam as a free DLC to all owners of the game, under the name Portal 2: Songs to Test By. On December 6, 2022, two new tracks were added, both being versions of the Still Alive mix played on the radios from the original Portal soundtrack.

Soundtrack

Notes:
* = not present.
Strikethrough = unused in-game

Filename paths when unspecified are assumed to be /sound/music or /media for videos.

Volume 1

On May 25, 2011 on the official Portal 2 blog, the first volume out of three of the complete soundtrack titled Portal 2 Soundtrack: Songs to Test By was released featuring the fully mixed tracks. Below are sections outlining the tracks from this volume.

OST #	Game #	Track title	Filename	Time	Level location	Comments
01	*	Science is Fun	*	02:33	Played during the Portal 2 TV Spot and other trailers.	An up-beat, techno-esque song. Technically: Guitar-ish sound with square waves, a somewhat high pitched sine wave and noisy percussion, ending with noise; lastly with a bass. Some tunes of the song are played when the player gains high speed using Propulsion Gel. During the PotatoFoolsDay ARG, a full version was released with the game 'BIT.TRIP BEAT'.
02	*	Concentration Enhancing Menu Initialiser	/SND0.AT3	02:16 (real length: 02:56)	In the PlayStation 3 menu selection when highlighting Portal 2.	A heavily remixed version of "There She Is" and "999999".
03	*	999999	music/mainmenu/portal2_background01.wav sp_a2_core_b1.wav sp_a2_core_b2.wav sp_a2_core_b2p2.wav	03:11	The Courtesy Call: Played from the beginning on the first main menu screen. The Escape: Played from a middle intense part when approaching the Central AI Chamber.	A dark and mysterious chimes-and-electronics piece (string-like sinewave-based synth) that builds with intensity. Then percussion is added in, drop then builds up again but slows down. The title refers to the Announcer's attempt at the beginning of The Courtesy Call to inform Chell of the length of time she has been in suspension for, which due to the high length of time or a malfunction, comes out as "nine nine nine... nine nine ni-."
04	01	The Courtesy Call	sp_a1_intro1_b1.wav sp_a1_intro1_b2a.wav sp_a1_intro1_b2b.wav playonce/scripted_sequences/mstr/sp_a1_intro1_b1.wav sp_intro_01_05_apple.wav	03:37	The Courtesy Call: When woken by Wheatley in the Aperture Science Extended Relaxation Center and throughout the container ride.	A story-driven piece that starts slow, then jumps into action as the song progresses. The second half has influences from "999999" and "Reconstructing Science". The title refers to the name of the first chapter. "01_05_apple" is unused in the final game, but is a rapid piano-based piece that presumably would have played when Wheatley asks Chell to "say apple".
05	02	Technical Difficulties	sp_intro_01_06_chambertop.wav sp_intro_01_07_chamberinside.wav sp_intro_01_08_chamberexit.wav	03:21 (in-game: 0:22 + 0:07 + 01:54)	The Courtesy Call: During parts of the Announcer-supervised testing chambers.	A subdued, mysterious, orchestral song. The title refers either to the television in the Extended Relaxation Vault, which says "We are currently experiencing technical difficulties." during the container ride, or to a line spoken by the Announcer, "We are currently experiencing technical difficulties due to circumstances of potentially apocalyptic significance beyond our control."
06	03	Overgrowth	sp_intro_02_lb1-1.wav sp_intro_02_lx1-1.wav sp_intro_02_lx2-1.wav sp_intro_02_lx3-1.wav	02:50 (Raw files: 9 seconds each)	The Courtesy Call: Ruined Chamber 01.	A quiet, eerie piece with light chimes.
07	04	Ghost of Rattman	sp_a1_intro3_b1.wav sp_a1_intro3_r1.wav sp_a2_trust_fling_r1.wav sp_a2_trust_fling_r2.wav sp_a2_bridge_the_gap_r1.wav sp_a2_bridge_the_gap_r2.wav sp_a2_pull_the_rug_r1.wav sp_a2_pull_the_rug_r2.wav	04:06	The Courtesy Call: Ruined Chamber 02. The Cold Boot: GLaDOS' Test Chamber 06 The Return: GLaDOS' Test Chamber 12 The Return: GLaDOS' Test Chamber 17	A subdued choir-and-electronics piece overlaid with an indistinguishable voice track. The strange voices heard in this track are presumed to be from Doug Rattmann. (However, it is unknown if he was dead or alive at the time.)
08	05	Haunted Panels	sp_a1_intro5_b1.wav	01:36 (in-game: 01:12)	The Courtesy Call: Ruined Chamber 05.	Another mysterious, subdued orchestral piece.
09	06	The Future Starts With You	sp_a1_intro6.wav	03:21 (in-game: 02:27)	The Courtesy Call: The second half of the new Chamber 06.	An eerie song. The name of this song refers to the Announcer line right at the beginning of the chamber, "Testing is the future, and the future starts with you." The songs seems to have a element from Technical Difficulties.
10	07	There She Is	sp_a1_wakeup_b1.wav sp_a1_wakeup_b2.wav	04:20 (in-game: 01:03 + 01:52)	The Courtesy Call: When nearing and walking through Central AI Chamber for the first time.	Calm piano with some sine chimes, later a pad comes in, high pitched percussion. A build-up that drops then decays abruptly shortly after building up again. The title refers to the player's first glimpse of GLaDOS in Portal 2, where Wheatley says "There she is..." (Which conveniently when the phrase is said, the second part of the song begins)
11	08	You Know Her?	sp_glados_01_03_awakes.wav sp_a2_intro.wav	03:10 (in-game: 01:46 + 01:13)	The Courtesy Call: When waking GLaDOS and climbing through the Incinerator Room.	March-like orchestral piece representing the way to the player's first boss. The title refers to Wheatley's comment as GLaDOS recognizes Chell, where he asks "You KNOW her?" The end of the song seems to resemble part of the music played whilst fighting Wheatley.
12	*	The Friendly Faith Plate	sp_a2_catapult_intro.wav sp_a4_finale1_b1.wav sp_a4_finale1_b1p2.wav	02:59	The Cold Boot: Portions are heard when flying through the air via an Aperture Science Aerial Faith Plate.	An arrangement of the Aerial Faith Plate music. Noise-dominant in a rhythmical fashion. (Distortion guitar? Kick drums, Synth bass?) game files are unused(?)
13	09	15 Acres of Broken Glass	sp_a2_trust_fling_b0.wav sp_a2_trust_fling_b1.wav sp_a2_trust_fling_b1.wav sp_a2_trust_fling_b2.wav sp_a2_trust_fling_b3.wav sp_a2_trust_fling_b4.wav sp_a2_trust_fling_b5.wav	04:59	The Cold Boot: GLaDOS' Test Chamber 06	Electronically eeire and dark yet upbeat-ish. The title is a reference to GLaDOS' line regarding the cleanup of the facility: "I have to go to the wing that was made entirely of glass and pick up fifteen acres of broken glass. By myself." It is also featured in the VR demo Moondust.
14	10	Love as a Construct	world/laser_node_lp_01.wav sp_a2_pit_flings.wav sp_a2_pit_flings_cc_01.wav	04:57 (Raw files: 02:57, 01:28)	The Cold Boot: GLaDOS' Test Chamber 07	Seems to be influenced by the Robot Ghost Story foundation. Contains the Companion Cube singing Cara Mia.
15	11	I Saw a Deer Today	sp_a2_ricochet_b1_01.wav sp_a2_ricochet_x1.wav sp_a2_ricochet_x1e.wav sp_a2_ricochet_l1_01.wav sp_a2_ricochet_l1_02.wav sp_a2_ricochet_l2_01.wav sp_a2_ricochet_l2_02.wav sp_a2_ricochet_l2_03.wav sp_a2_ricochet_c1_01.wav sp_a2_ricochet_c1_02.wav sp_a2_ricochet_c2_01.wav sp_a2_ricochet_c2_02.wav sp_a2_ricochet_c2_03.wav sp_a2_ricochet_c3_01b.wav sp_a2_ricochet_c3_02.wav sp_a2_ricochet_c3_03.wav	03:13	The Return: Portions are heard while engaging laser locks and ricocheting off of Aperture Science Aerial Faith Plates in GLaDOS' Test Chamber 10.	An electric popping-clicking piece. Reminiscent of "4000 Degrees Kelvin" from the Portal soundtrack. The title refers to a line where GLaDOS asserts, "It's a beautiful day out. Yesterday I saw a deer." Oddly, the only time GLaDOS refers to the deer and the day, she states "Well, you passed the test. I didn't see the deer today." which contradicts the title.
16	*	Hard Sunshine	sp_a2_bridge_intro_lbout.wav sp_a2_bridge_the_gap_lbout.wav sp_a2_pull_the_rug_lbout.wav	02:48	The Return: Some Hard Light Bridges emit this.	Contains hints of the Turret Opera. Only one that draws a 'proper' Lissajous figure when viewed through a XY oscilloscope, incomplete square in diagonal. The title is a reference to the Hard Light Bridge, which GLaDOS claims is made of natural light (Example: sunshine), thus "hard sunshine."
17	12	I'm Different	sp_a2_turret_intro_b1.wav sp_a2_turret_intro_x1.wav	04:28	The Return: Portions are played when carrying or knocking over turrets in GLaDOS' Test Chamber 13.	The song seems to take some of its melody from "An Accent Beyond". The title of this track is a reference to the Oracle Turret found on the Turret Redemption Line, which says "I'm different..." upon being approached.
18	13	Adrenal Vapor	sp_a2_laser_relays_l1_01.wav sp_a2_laser_relays_l2_01.wav sp_a2_laser_relays_l3_01.wav	02:36 (Raw files: 5 seconds each)	The Return: GLaDOS' Test Chamber 14, where GLaDOS mentions adrenal vapor, hence the name.	A warbling song produced while engaging laser locks in one of the Test Chambers. Purely a sine wave-based synth, the note sequence described below is played in an alternating manner on each channel producing wave phasing. The title refers to GLaDOS' statement just before entering the Test Chamber, "I simulate daylight at all hours and add adrenal vapor to your oxygen supply." The track is produced by generating two identical, repeating sequences of notes, one of which has a slightly faster tempo than the other. As the sequences go out of phase, human listeners perceive a transition and echoing effect and then a radical alteration of the original song, even though the notes remain identical throughout. This is a highly "experimental" style first pioneered by minimalist artists in the 1960s.
19	*	Turret Wife Serenade	sp_a2_lasers_vs_turrets_r1.wav	01:38	The Return: Easter Egg in GLaDOS' Test Chamber 16.	A song performed by the Turret Quartet under the Rattmann Den. Jazz influences, Beat foundation is done by a turret being trumpet-like. Exact copy of the in-game file.
20	14	I Made It All Up	sp_a2_laser_over_goo_l2.wav sp_a2_laser_over_goo_l1.wav sp_a2_column_blocker_l1_01.wav sp_a2_column_blocker_l2_01.wav sp_a2_column_blocker_l3_01.wav sp_a2_column_blocker_l4_01.wav sp_a2_column_blocker_l5_01.wav	03:56	The Cold Boot: A scaled-down version plays when the laser-activated platform is moving in the fourth GLaDOS chamber. The Surprise: While engaging the laser locks in GLaDOS' Test Chamber 18.	A quiet, warbling electronics song. This refers to GLaDOS's line after revealing that her first "surprise" is the complete absence of one: "I made it all up". The song seems to have the same instrument from Self Esteem Fund from the Portal Soundtrack.
21	15	Comedy = Tragedy + Time	sp_a2_laser_chaining_b1.wav sp_a2_laser_chaining_l1.wav sp_a2_laser_chaining_l2.wav sp_a2_laser_chaining_l3.wav	03:29	The Surprise: GLaDOS' Test Chamber 19.	A mixture of beats and electronic noises. Upbeat, driven by a eerie sound highlighting a metallic pounce. The title refers to GLaDOS' statement, "Well, you know the old formula: Comedy equals tragedy plus time."
22	?	Triple Laser Phase	sp_a2_triple_laser_l1_01.wav sp_a2_triple_laser_l2_01.wav sp_a2_triple_laser_l3_01.wav	04:15	The Cold Boot: GLaDOS' first four Test Chambers when Thermal Discouragement Beam catchers are enabled. The Surprise: GLaDOS' Test Chamber 20.	A plaintive song that fades between tones. Resembles laser vocalization. Softened laser synth that's also used in Die Cut Laser Dance.

Volume 2

On July 1, 2011 on the official Portal 2 blog, the second volume out of three of the complete soundtrack titled Portal 2 Soundtrack: Songs to Test By and featuring the fully mixed tracks was released for free. This one includes exclusive ringtones of some of the in-game sound effects.

OST #	Game #	Track title	Filename	Time	Level location	Comments
01	*	You Will Be Perfect	*	02:39	"Perfect 10" trailer. Coop Campaign: The "Cooperative Testing Initiative" trailer.	A fast tempo electronic song with a recognizable theme. The middle part of the track shows influences from "Reconstructing More Science".
02	?	Halls of Science 4	*	04:35	The beginning of the Portal 2 TV Spot.	Mock up of slightly distorted sine waves, finishes with a clean sinewave. Similar execution found in Adrenal Vapor, Forwarding the Cause of Science and You're not Part of the Control Group.
03	?	Bots Build Bots or (defun botsbuildbots () (botsbuildbots))	music/mainmenu/portal2_background02.wav	04:07	The Escape: The second main menu screen, which displays a conveyor belt inside the Turret Factory.	A soothing song with harp and winds, gradually turning into a complex electronic song, with the melody still present, eventually ending how it starts. Contains Die Cut Laser Dance beat. Although listed as "Bots Build Bots" on the website and in filename, the song's title is listed as "(defun botsbuildbots () (botsbuildbots))". This is a program written in LISP that defines a function that recursively (and endlessly) calls itself; effectively, an infinitely continuous loop. LISP is a programming language that has been heavily used in AI research since being developed in 1958.
04	?	An Accent Beyond	sp_a2_bts1_b1.wav sp_a2_bts1_x1.wav sp_a2_bts2_x1.wav	02:58	The Escape: During the escape after GLaDOS Test Chamber 21.	An up-tempo song with a repeating electronic melody. The title is a reference to Wheatley's claim that he is "speaking in an accent that is beyond her range of hearing".
05	?	Robot Ghost Story	sp_a2_bts3_b1.wav sp_a2_bts3_x1.wav	03:07	The Escape: When Wheatley tells the story about the replicas.	A slow, quiet electronic song with haunting melodies from "PotatOS Lament".
06	?	Die Cut Laser Dance	sp_a2_bts3_b2.wav	02:00	The Escape: While on the conveyor moving large pieces of metal to be cut and later constructed into turrets.	Choppy electronic noises, with fun dance melody in the background. Isolated and extended version from the slowed-down cameo in "Bots Build Bots".
07	?	Turret Redemption Line	sp_factory_01_redemption_01.wav	03:23 (Raw file: 01:38)	The Escape: On the Turret Redemption Line.	Representation of turret's fate? The track seems to have influences from "I AM NOT A MORON!" and "You Know Her?".
08	?	Bring Your Daughter to Work Day	sp_a2_bts4_b2.wav sp_a2_bts4_b3.wav	02:40	The Escape: Whilst looking at the science projects produced by the employee daughters.	Upbeat electronic, one of the few songs with abrupt volume changes. Gets softer and orchestral as it progresses.
09	?	Almost at Fifty Percent	sp_a2_bts5_b0.wav sp_a2_bts5_x1.wav sp_a2_bts5_x2.wav sp_a2_bts5_x3.wav	01:59	The Escape: In the Neurotoxin Generator chamber.	The song uses an alarm-like sound that plays throughout the song, near the ending the song runs into a action-like drum and synthesizer, then ends with a wind-like noise. The title refers to Wheatley mistakenly believing the neurotoxin levels went up to 50%, although like "I Saw A Deer Today" the title itself is not actually said during the game.
10	?	Don’t Do It	sp_a2_core_b3.wav sp_a2_core_b3p2.wav sp_a2_core_b3p3.wav sp_a2_core_b3p4.wav sp_a2_core_b4.wav sp_a2_core_b5.wav sp_a2_core_b6.wav sp_a2_core_b7.wav sp_a2_core_b8.wav	05:16	The Escape: When arriving in GLaDOS' rebuilt Central AI Chamber and during the subsequent stalemate resolution.	GlaDOS homage with a Rock tune. ending with ambience. The song title is a reference to GLaDOS' repeated request when Chell is presented with the stalemate resolution button. The track sounds very similar to the track "You Know Her?".
11	?	I AM NOT A MORON!	sp_a2_core_b8p2.wav sp_a2_core_b9.wav	03:46	The Escape: Wheatley's takeover after the stalemate button is pressed.	A story driven song that starts off as an ambient melody which slowly builds up in intensity. The song then transitions to a very enthusiastic and upbeat electronic tune, followed by another slow ambient build up. The song ends with an orchestra that once again builds up to a violent end. The song title is a reference to Wheatley's reaction to GLaDOS calling him a moron.
12	?	Vitrification Order	sp_a3_01_b2.wav sp_a3_01_b3.wav sp_a3_01_b4.wav	06:34	The Fall: When heading through the old Aperture structures toward the condemned testing area.	The title references the vitrification order signs in the old Aperture test chambers.
13	?	Music of the Spheres	sp_a3_03_b1.wav sp_a3_03_b2.wav sp_a3_03_b3.wav sp_a3_transition01_b1.wav	03:38	The Fall: In the entry room of old Aperture after unlocking the massive vault door. The latter portion also plays after completing the 1950's test chambers. It is also featured in the VR demo Moondust.	Soaring melody with some electronic tones. The tempo increases throughout the piece. Contains unmixed segments of "999999".
14	?	You Are Not Part of the Control Group	sp_a3_jump_intro_b1.wav sp_a3_jump_intro_z1.wav sp_a3_jump_intro_z1b.wav sp_a3_jump_intro_z1c.wav sp_a3_jump_intro_b2.wav sp_a3_jump_intro_z2.wav sp_a3_jump_intro_z2b.wav sp_a3_jump_intro_z2c.wav	03:24	The Fall: During first Repulsion Gel test.	The title refers to Cave Johnson reminding Test Subjects that they are not part of the unfortunate "control group" who took part in potentially lethal tests. Sinewaves playing interchangeably, speeding up. Execution similar to Adrenal Vapor except for being slower with more clicks.
15	?	Forwarding the Cause of Science	sp_a3_bomb_flings_b1.wav sp_a3_bomb_flings_z1.wav sp_a3_bomb_flings_z1b.wav sp_a3_bomb_flings_z1c.wav sp_a3_bomb_flings_z1d.wav sp_a3_bomb_flings_z1e.wav sp_a3_bomb_flings_c1.wav sp_a3_bomb_flings_z2.wav sp_a3_bomb_flings_z2b.wav sp_a3_bomb_flings_z2c.wav sp_a3_bomb_flings_c2.wav	03:40	The Fall: During the 1950's test chambers.	Appears to be a noiser and faster remix of "You Are Not Part of the Control Group".
16	?	PotatOS Lament	music/mainmenu/portal2_background03.wav sp_under_potatos_v1_01.wav sp_under_potatos_x1_01.wav	01:59 (raw files: 1:49)	The Fall: The third main menu screen, featuring the old Aperture structures.	Orchestral strings with eerie crying GlaDOS vocalization. The synthesized vocals are that of GLaDOS, whilst being trapped in the potato. The word "potato" can also be heard frequently throughout the song. The exact langauage and lyrics of the song have yet to be revealed, but it is most likely in Latin (although some parts may be gibberish), as at the beginning of the song, GLaDOS can be clearly heard to use the Latin word "Lacrimosa", which means "Weeping". Vocal sample present in isolated form.
17	?	The Reunion	sp_a3_speed_ramp_b1.wav sp_a3_speed_ramp_b2.wav sp_a3_speed_ramp_c1.wav sp_a3_speed_ramp_c2.wav sp_a3_speed_ramp_c3.wav sp_a3_speed_ramp_z1.wav sp_a3_speed_ramp_z1b.wav sp_a3_speed_ramp_z1c.wav sp_a3_speed_ramp_z1d.wav	03:45	The Reunion: In the 1970's test chambers, with Propulsion Gel.	A heavily remixed version of "Forwarding the Cause of Science".
18	?	Music of the Spheres 2 (Incendiary Lemons)	sp_a3_portal_intro_b1.wav sp_a3_portal_intro_b4_2.wav sp_a3_transition01_b1.wav	02:43	The Reunion: The beginning and end of the 1970's test chambers and in several locations in the 1980's test chambers.	Basically a continuation of "Music of the Spheres", with the instrumentation gradually being replaced with beeps reminiscent of primitive MIDI synthesizers. The part of the title in parentheses is a reference to Cave Johnson's message about how he would "...burn your house down! With the lemons!" Contains unmixed segments from "999999".

Volume 3

On October 1, 2011 on the official Portal 2 blog, the third volume out of three of the complete soundtrack titled Portal 2 Soundtrack: Songs to Test By and featuring the fully mixed tracks was released for free, with a link to download the entire soundtrack.

OST #	Game #	Track title	Filename	Time	Level location	Comments
01	?	Reconstructing More Science	sp_a4_finale4_z2.wav	02:36	Portal 2 teaser trailer. The Part Where He Kills You: In the final level when using the Propulsion Gel during the fight with Wheatley, at the beginning of the ending elevator ride.	An electronic piece that vibrates with GLaDOS' renewal of the Aperture Science test chambers.
02	?	Wheatley Science	music/mainmenu/portal2_background04.wav	02:29	The Itch: Played in the fourth main menu.	Upbeat pop/rock-ish. A reference to when Wheatley takes control of Aperture and starts making tests while the facility starts self-destructing with the Announcer's warning.
03	?	Franken Turrets	sp_a4_intro_b0.wav sp_a4_intro_b1.wav sp_a4_intro_b2.wav sp_a4_intro_b3.wav	04:08	The Itch: In the first Wheatley chamber, which consists of the Frankenturret-dedicated chamber and the chamber with the harmless "moat" area.	Consists of high-pitched ringing sounds and a rhythmic backing track, which gives a sense of a high-tech environment, while also portraying slight feelings of mourning and nostalgia.
04	?	Machiavellian Bach	sp_a4_tb_catch_b1a.wav sp_a4_tb_catch_c1b.wav sp_a4_tb_catch_c1c.wav	04:01 (raw files: 2:00 each)	The Itch: The classical music piece that Wheatley plays in Test Chamber 5.	Based off Bach's Little Prelude in C minor, BWV 934. Interestingly, the piece has been transposed into F minor. Electronic clips can be heard when using the Aerial Faith Plates.
05	?	Excursion Funnel	sp_a4_tb_intro_tbin.wav sp_a4_tb_trust_drop_tbin.wav sp_a4_laser_platform_tbin.wav sp_a4_finale1_tbin.wav	04:32	The Itch and The Part Where He Kills You: When inside an Excursion funnel.	Eerie echoing ringing sounds with added electronics. Muffles in-game audio. A repeated note in the background bears similarity to the one from the Half-Life 2: Episode Two track "Dark Interval".
06	?	TEST	sp_a4_tb_intro_b1.wav sp_a4_tb_trust_drop_b1.wav sp_a4_tb_wall_button_b1.wav	06:14	The Itch: All of Wheatley's test chambers, except chamber 5. The theme becomes more intense with each chamber.	Consists of a reworked version of "Franken Turrets". A reference to Wheatley's attempt to distinguish his first test chamber from GLaDOS's by writing "TEST" on the wall with white panels.
07	?	The Part Where He Kills You	sp_a4_finale1_b1p3.wav sp_a4_finale1_b2p2.wav sp_a4_finale1_b3.wav sp_a4_finale1_b4.wav sp_a4_finale2_b1.wav	03:32	The Part Where He Kills You: In the fake Test Chamber 17, when Wheatley attempts to kill Chell realizing that he no longer needs her. The first section also plays when using the Excursion Funnel just after Chamber 12, where the elevator has melted.	Contains a minor-key version of "Excursion Funnel" and elements of "Wheatley Science" within the first minute.
08	?	Omg, What has He Done?	sp_a4_finale3_b2.wav sp_a4_finale3_b4.wav sp_a4_finale3_b4p2.wav	02:24	The Part Where He Kills You: The Excursion Funnel ride towards Wheatley's Lair.	Parts of it are basically a slowed down remix of "Wheatley Science" that would speed up. A reference to GLaDOS's cries of dismay at seeing her beloved facility crumble into pieces under the control of Wheatley.
09	?	Bombs for Throwing at You	sp_a4_finale4_b1.wav sp_a4_finale4_b2.wav sp_a4_finale4_b3.wav sp_a4_finale4_b4.wav sp_a4_finale4_b5.wav sp_a4_finale4_b6.wav sp_a4_finale4_b7.wav sp_a4_finale4_b8.wav sp_a4_finale4_b9.wav sp_a4_finale4_z1.wav sp_a4_finale4_z2.wav	05:48	The Part Where He Kills You: Final boss of the game.	In reference to the bombs used in the final battle with Wheatley in his chamber, as introduced in his sentence "Bombs. For throwing at you.". Note: the version on the soundtrack is a slightly modified version of the in-game music.
10	?	Your Precious Moon	sp_a4_finale4_b10.wav sp_a4_finale4_b11.wav sp_a4_finale4_b12.wav playonce/scripted_sequences/mstr/shoot_the_moon_mix_01.wav	01:55	The Part Where He Kills You: When the Portal is placed on the Moon.	The title refers to one of the lines Wheatley will say as the player looks up at the Moon. Similar to "Don't Do It"
11	?	Caroline Deleted	playonce/scripted_sequences/mstr/shoot_the_moon_mix_01.wav sp_a5_x1.wav	01:50 (final part of the speech mix, a5_x1 starts at like 0:10 of OST and lasts 01:20 by itself)	The Credits: In GLaDOS' chamber before leaving.	Deletion's mourning fading into a happy and fast melody towards GlaDOS' positivity. Contains segments from "999999" and "Reconstructing More Science".
12	?	Cara Mia Addio	sp_30_a4_finale5.bik	02:33 (Video length: 02:07)	The Credits: Ending before credits. Sung by the Turret Opera as Chell leaves on the elevator ride out of the facility.	The first 3 seconds of the song appear to be a higher pitched sound similar to the start of "Don't Do It". The song is sung by Ellen McLain in bad Italian. Unlike other songs, the version of the song on the official soundtrack has been slightly extended and contains a short segment that can barely be heard for a few seconds at the end of the cutscene.
13	?	Want You Gone	portal2_want_you_gone.wav	02:21	The Credits: The credits screen sung by GLaDOS.	Replica of the song found in-game. The successor to Still Alive, also composed by Jonathan Coulton.
14	?	Spaaaaace	sp_ending_callback.bik	00:45	The Credits: During Wheatley's final thoughts while stranded in Space, immediately following the credits.	A track mostly made up of ambient sounds. The title is a reference to the Space Core's "SPAAAACE!"
15	?	Space Phase	music/mainmenu/portal2_background05.wav	01:32	The Credits: Fifth main menu after completing the Single Player campaign.	A short version of "I Made It All Up" with additional strings from "Cara Mia Addio".
16	?	Some Assembly Required	coop_intro.bik mp_coop_dissassembly.wav	01:50 (fmv: 01:02, transitions: 0:06)	Coop Campaign: During the co-op introduction and when you get disassembled on level transitions.	Beginning with a sine pulse, bursts into a cacophony, very electronic rock-ish piece. somewhat palindromic as many other songs.
17	?	Robot Waiting Room #1	mp_coop_lobby_2_c1.wav mp_coop_hallway_c1.wav	02:14 (1:07 each)	Coop Campaign: Plays in the Hub when nothing is unlocked.	A snippet from "You Are Not Part of the Control Group". Combination of Hub and Hallway files.
18	?	Robot Waiting Room #2	mp_coop_lobby_2_c2.wav mp_coop_hallway_c2.wav	02:14 (1:07 each)	Coop Campaign: Plays in the Hub after Team Building is completed.	A snippet from "You Are Not Part of the Control Group". Combination of Hub and Hallway files. It is also featured in the VR demo Moondust.
19	?	Robot Waiting Room #3	mp_coop_lobby_2_c6.wav mp_coop_hallway_c6.wav	02:14 (1:07 each)	Coop Campaign: Plays in the Hub after Mass And Velocity is completed.	Combination of Hub and Hallway files.
20	?	Robot Waiting Room #4	mp_coop_lobby_2_c4.wav mp_coop_hallway_c4.wav	02:14 (1:07 each)	Coop Campaign: Plays in the Hub after Hard-Light Surfaces is completed. Also plays after starting The Final Hours of Portal 2.	A snippet from "Halls of Science 4". Combination of Hub and Hallway files.
21	?	Robot Waiting Room #5	mp_coop_lobby_2_c5.wav mp_coop_hallway_c5.wav	02:14 (1:07 each)	Coop Campaign: Plays in the Hub after Excursion Funnels is completed.	Combination of Hub and Hallway files.
22	?	Robot Waiting Room #6	mp_coop_lobby_2_c7.wav	02:06 (01:03 twice)	Coop Campaign: Plays in the Hub after Mobility Gels is completed.	A reworked version of "Forwarding the Cause of Science", influenced by "The Friendly Faith Plate" beat and "Halls of Science", "Bring Your Daughter to Work Day" foundations.
23	?	You Saved Science	coop_outro.bik	00:47	Coop Campaign: Before the coop credits when the Vault is opened.	Refers to the robots finding the Vault and GLaDOS' saying "You saved science!"
24	?	Robots FTW	coop_outro.bik portal2_robots_ftw.wav	03:38 (Raw: 02:19)	Coop Campaign: Ending movie and over Coop Credits, behind GLaDOS' comments about the test subjects.	An upbeat, energetic electronic song. The title is short for "Robots For The Win".
25	*	Still Alive (Radio Mix)		0:45	Portal: Radios found throughout the game.	The track that plays on the radios in the previous Portal title. Added to the soundtrack on December 6, 2022.
26	*	Still Alive (Radio Mix Clean)		0:45	*	A version of the song without the radio filter. Added to the soundtrack on December 6, 2022.

Ringtones

Volume 1

Track title	Filename	Time	Snippet source	Comments
Turret Wife Serenade	sp_a2_lasers_vs_turrets_r1.wav	00:19	00:08-00:27
Science Is Fun		00:18
The Friendly Faith Plate		00:16
The Courtesy Call		00:16	01:09-01:25
I Saw a Deer Today		00:29
Comedy Equals Tragedy Plus Time		00:29

Volume 2

Track title	Filename	Time	Snippet source	Comments
Halls of Science		00:14
Music of the Spheres		00:19
You Are Not Part Of The Control Group		00:19
PotatOS Lament		00:15
You Will Be Perfect	*	00:13
Bring Your Daughter To Work Day	*	00:16	00:00-00:16

Track title	Filename	Time	Comments
Button Positive	buttons/button_synth_positive_01.wav	00:01.533
Button Negative	buttons/button_synth_negative_02.wav	00:01.347
Blue Paint	player/paint/player_bounce_jump_paint_03.wav	00:02.345
Shoot Blue Portal	weapons/portalgun/wpn_portal_gun_fire_blue_01.wav	00:00.813
Door Close	plats/door_round_blue_close_01.wav	00:01.091
Door Open	plats/door_round_blue_open_01.wav	00:00.697
Shoot Orange Portal	weapons/portalgun/wpn_portal_gun_fire_red_03.wav	00:00.906
Turret Machine Gun	npc/turret/turret_fire_4x_03.wav	00:00.511

Volume 3

Track title	Filename	Time	Snippet source	Comments
Reconstructing More Science		00:08
Your Precious Moon		00:10
Cara Mia Addio	sp_30_a4_finale5.bik	00:09
Want You Gone	portal2_want_you_gone.wav	00:09
Some Assembly Required	coop_intro.bik	00:06
Robots FTW	portal2_robots_ftw.wav	00:09	00:14-00:23

Other music

The following tracks were not included in the game's soundtrack release.

"Exile Vilify"

Plays on an Aperture Science Radio. This song is composed by The National, and is the only pop rock song in the game besides "Want You Gone".

Location played: The Rattmann Den near Test Chamber 03 in Chapter 2.

"Offering"

A segment of smooth jazz music played to tranquil testers in the face of almost certain death. This song is composed by Larry Stephens and is from his album also titled "Offering".

Location played: The original Test Chamber 04 from Portal as seen in Chapter 1. Only a small segment is played before the speakers glitch and shut down.

Comments: Filename is prehub42.wav.

"Reconstructing Science"

An electronic piece and predecessor to Reconstructing More Science. Not present in the soundtrack for unknown reasons.

Location played: E3 trailers - namely a environments showcase and at the end of the Propulsion Gel demonstration. A short excerpt is used in the other demonstration videos.

"SynTek Residential Mall"

A relaxing mall music that was originally taken from Alien Swarm, precisely in the Syntek Residential map. It isn't part of the soundtrack, but it was used in the valentine promotional video.

Location played: Valentine's Day Gift Buying - throughout the background of the video.

External links

• Songs to Test By on the Official Portal 2 Website
• Portal 2 Soundtrack on Steam