 When speaking about voice in his treatise De Anima (On the Soul), Aristotle wrote that sound is a “certain movement of air” (De Anima II.8 420b12) but, even though he claimed that sound and motion are tightly connected, he did not seem to identify them (Pasnau 2000: 32).  The natural scientists of the seventeenth century refined the intuition that sound is a movement of air into the wave theory of sounds, which appeared to be an obvious competitor for the quality or sensation (proximal) view. Galileo registered that 