In an attempt to make people like them even more, Valve has released the soundtrack for Portal 2 on thier website for absolutly free.
By going to Valve's website you can get Volume 1 of the Portal 2 soundtrack "Songs to Test By," which contains 22 tracks from the game that are guranteed to make your ear holes happy with delite. Furthermore Valve is also offering 6 tracks as iPhone and Android ringtones.
Science has proven that listening to the Portal 2 soundtrack will makes ears happy. So you owe it to not only science but also your ears to download Volume 1 of Songs to Test By right away.