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Can't get enough of the music in Valve's excellent puzzler Portal 2? Want others to know just how much you love Portal 2 by using the 'Turret Wife Serenade' as your ringtone? Well, you're in luck, because Valve has decided to release the first of three volumes of the Portal 2 soundtrack for free!

Entitled 'Songs to Test By', Volume 1 includes 22 tracks from the game, which you can listen to to your heart's content by downloading it over here (157 MB), or selecting a few of the tracks as a ringtone from the music page.

[via Official Portal 2 site]