* The track ''9999999'' is actually a remix of ''Music of the Spheres I'', best heard when the slow part ends.
* The track ''The Courtesy Call'' has its first part unique to itself, the second part is a sped-up version of ''Music of the Spheres I'' and the last part is a slowed-down version of ''Reconstructing More Science''
Shorter versions of particular songs, or sound effects from the game, are available as ringtones from the website above. The soundtrack was released in three volumes: The first, titled Volume 1, was released on May 25, 2011; Volume 2 on July 1, 2011, Volume 3 on Sept. 30, 2011, and as a 4-disk Collectors Edition on October 30, 2012.
The Collectors Edition also includes in-game promotional items for Team Fortress 2, and to & in-game promotional items for Dota 2, and the Turret Lullaby comic.
Vitrification Order by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 2 [6:34] | Download| Play
Music of the Spheres by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 2 [3:38] | Download| Play
You are Not Part Of the Control Group by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 2 [3:24] | Download| Play
Forwarding the Cause of Science by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 2 [3:40] | Download| Play
PotatOS Lament by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 2 [1:59] | Download| Play
The Reunion by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 2 [3:45] | Download| Play
Music of the Spheres 2 (Incendiary Lemons) by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 2 [2:43] | Download| Play
Portal 2: Songs to Test By - Volume 3 (Collectors Edition Disk #3)
Album: Portal 2: Songs to Test By - Volume 3 by Aperture Science Psychoacoustics Laboratory
Reconstructing More Science by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:36] | Download| Play
Wheatley Science by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:29] | Download| Play
Franken Turrets by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [4:08] | Download| Play
Machiavellian Bach by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [4:01] | Download| Play
Excursion Funnel by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [4:32] | Download| Play
TEST by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [6:14] | Download| Play
The Part Where He Kills You by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [3:23] | Download| Play
Omg, What has He Done? by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:24] | Download| Play
Bombs for Throwing at You by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [5:48] | Download| Play
Your Precious Moon by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [1:55] | Download| Play
Caroline Deleted by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [1:50] | Download| Play
Cara Mia Addio! by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:33] | Download| Play
Want You Gone by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:21] | Download| Play
Spaaaaace by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [0:45] | Download| Play
Space Phase by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [1:32] | Download| Play
Some Assembly Required by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [1:50] | Download| Play
Robot Waiting Room #1 by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:14] | Download| Play
Robot Waiting Room #2 by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:14] | Download| Play
Robot Waiting Room #3 by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:14] | Download| Play
Robot Waiting Room #4 by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:14] | Download| Play
Robot Waiting Room #5 by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:14] | Download| Play
Robot Waiting Room #6 by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [2:06] | Download| Play
You Saved Science by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [0:47] | Download| Play
Robots FTW by Aperture Science Psychoacoustics Laboratory on Portal 2: Songs to Test By - Volume 3 [3:38] | Download| Play
Collectors Edition Disk #4
There are no downloads because it's a copyrighted disk.
Album: Portal 2: Songs to Test By by Aperture Science Psychoacoustics Laboratories
Subject Name Here by Valve Studio Orchestra on The Orange Box Original Soundtrack [1:44] | Download| Play
Taste Of Blood by Valve Studio Orchestra on The Orange Box Original Soundtrack [3:06] | Download| Play
Android Hell by Valve Studio Orchestra on The Orange Box Original Soundtrack [3:45] | Download| Play
Self Esteem Fund by Valve Studio Orchestra on The Orange Box Original Soundtrack [3:30] | Download| Play
Procedural Jiggle Bone by Valve Studio Orchestra on The Orange Box Original Soundtrack [4:34] | Download| Play
No Cake For You by Valve Studio Orchestra on The Orange Box Original Soundtrack [4:05] | Download| Play
4000 Degrees Kelvin by Valve Studio Orchestra on The Orange Box Original Soundtrack [1:01] | Download| Play
Stop What You Are Doing by Valve Studio Orchestra on The Orange Box Original Soundtrack [4:00] | Download| Play
Party Escort by Valve Studio Orchestra on The Orange Box Original Soundtrack [4:21] | Download| Play
You're Not A Good Person by Valve Studio Orchestra on The Orange Box Original Soundtrack [1:24] | Download| Play
You Can't Escape, You Know by Valve Studio Orchestra on The Orange Box Original Soundtrack [6:24] | Download| Play
Still Alive by Jonathon Coulton on The Orange Box Original Soundtrack [2:56] | Download| Play
Still Alive (J.C. Mix) by Aperture Science Psychoacoustics Laboratories on Portal 2: Songs to Test By - Volume 4 [2:57] | Download| Play
The track 9999999 is actually a remix of Music of the Spheres I, best heard when the slow part ends.
The track The Courtesy Call has its first part unique to itself, the second part is a sped-up version of Music of the Spheres I and the last part is a slowed-down version of Reconstructing More Science
[[Media:Template:Dictionary/audio/i am not a moron|Download]] | 
[[Media:Template:Dictionary/audio/i am not a moron|Play]]