"Voice is a kind of sound characteristic of what has soul in it; nothing that is without soul utters voice, it being only by a metaphor that we speak of the voice of a flute or the lyre or generally of what (being without soul) possesses the power of producing a succession of notes which differ in length and pitch and timbre."
— Aristotle (384-322 B.C.)
(420b5-10, pp. 204-5)
Reading in Aristotle, Introduction to Aristotle, trans. R. McKeon. (Chicago and London: The University of Chicago Press, 1973).