 Lippman (1992: chapter 1) observes that Greek Antiquity is responsible for two ideas that shaped Western musical thought until at least the seventeenth century. The first amounts to a metaphysical claim. While details vary greatly, this is the claim that the laws and structure of music correspond to those of the universe. This view is at times supplemented with the additional thought that celestial bodies themselves produce music as they follow their orbits. The Pythagorean concept of cosmic harmony, or harmony of the spheres, is the first known example of the metaphysical conception of music. The second idea is an ethical view, sometimes referred to as ethos theory. According to this view, music has the capacity to alter mood and mold personality, and thus may contribute to moral education (see Lippman 1964: chapter 2).