
Sound is the circle of form and substance (number of oscillations/circles produces a reliable tone). Everything talks (sings) (is a sound) (makes a noise) (moves). Sound is circular (relative) movement (twelve relative tones, oscillations, circles, in a circle).
(Image: http://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Circle_of_fifths.svg/500px-Circle_of_fifths.svg.png)