But voice is a certain sound of that which is animated; for nothing inanimate emits a voice; but they are said to emit a voice from similitude, as a pipe, and a lyre, and such other inanimate things, have extension, modulation, and dialect; for thus it appears, because voice, also, has these.
Book II: On the soul; In: Aristotle (1808). Works, Vol. 4. p. 63 (412a-424b) - De Anima