Every single person on the planet knows the pentatonic scale, and I believe that this speaks volumes. Music is indeed language, and we all know it. It has been put there within us for a reason, and to harness it brings about freedom that we can't verbalize. This is why we do what we do. Whether a musician, or someone who simply enjoys music, we all sense the magnanimity of a song from the deeps of our heart and soul. This is the kind of thing that helps set the captive free.