Without music there can be no perfect knowledge, for there is nothing without it. For even the universe itself is said to have been put together with a certain harmony of sounds, and the very heavens revolve under the guidance of harmony.
[Itaque sine Musica nulla disciplina potest esse perfecta, nihil enim sine illa. Nam et ipse mundus quadam harmonia sonorum fertur esse conpositus, et coelum ipsud sub harmoniae modulatione revolvi.]
Isidore of Seville (c. 560 - 636) Spanish scholar and cleric [Isidore the Younger, Isidorus Hispalensis]
Etymologiae, Book 3, ch. 17 “On the Power of Music,” § 1 [tr. Brehaut (1912)]
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