The Official Portal 2 Website points the way to the Portal 2 Music Page where they offer free downloads of volume one of Songs to Test By, the soundtrack to Portal 2, Valve's puzzle/platformer sequel. They say the 157 MB download is the "first of three downloadable aural stimulus packages." Word is: "Whether you're a mega-science corporation with decades of test experience, or a young start-up liberating your first test subject from non-testing with a chloroform-soaked rag, Aperture guarantees results. Wake up your test subject, open the chamber door, and press play--let Aperture's patent-pending rhythmic compliance enhancers do the rest."