Valve is offering downloads of the Portal 2 soundtrack volume 1, 2, and 3 for FREE for a limited time.

The Portal 2 soundtrack volume 1 includes 22 MP3 tracks and six ringtones for iPhone or Android phones. The Portal 2 soundtrack volume 1 includes 18 MP3 tracks and 14 ringtones for iPhone or Android phones. And the Portal 2 soundtrack volume 3 includes 24 MP3 tracks and 6 ringtones for iPhone or Android phones.