Portal 2 Soundtrack: Songs to Test By (Volumes 1–3)
~ Release group by Aperture Science Psychoacoustic Laboratories
Initially released in 3 volumes over a period of several months in 2011.
They were later collected into a separate release containing all three volumes.
A collector's edition including music from Portal 1 was made available the following year on CD and digital media. (initially the digital version had 2 discs: one for portal 2 and one for the portal 1 bonus disc. The digital version was later revised to split the volumes into separate "discs"
Album + Soundtrack
|includes:||Portal 2: Songs to Test By, Volume 1|
Portal 2: Songs to Test By, Volume 2
Portal 2: Songs to Test By, Volume 3
|other databases:||https://rateyourmusic.com/release/comp/aperture_science_psychoacoustics_laboratory/portal_2_soundtrack__songs_to_test_by/ [info]|
|standalone website:||http://www.thinkwithportals.com/music.php [info]|