All three volumes of the Songs To Test By: Portal 2 soundtrack album by Mike Morasky of Aperture Science Psychoacoustic Laboratories, along with numerous ringtones, are available for free download in mp3 format through Valve's Thinkwithportals website.

The physics-based puzzle-platformer blends synthetic-sounding compositions on electronic piano, oddly modulated chip music and unusual rhythm patterns to reflect the theme of computers run amok. End credits break-up song "Want You Gone," the spiritual successor to "Still Alive," is written by Jonathan Coulton and performed by GLaDOS voice actor Ellen McLain. "Cara Mia Addio," depicting a chorus of singing turrets, capitalizes on McLain's background as an opera singer.

Portal 2 is available for Windows, Mac and Linux, along with Xbox 360 (with Xbox One backward compatibility) and PlayStation 3. The four-hour, 77-track soundtrack is streaming on Amazon Music, Apple Music and Spotify.


From the Steam product page:

Portal 2 draws from the award-winning formula of innovative gameplay, story, and music that earned the original Portal over 70 industry accolades and created a cult following.

The single-player portion of Portal 2 introduces a cast of dynamic new characters, a host of fresh puzzle elements, and a much larger set of devious test chambers. Players will explore never-before-seen areas of the Aperture Science Labs and be reunited with GLaDOS, the occasionally murderous computer companion who guided them through the original game.

Thinkwithportals - Portal 2: Songs to Test By