And it came to pass, when the evil spirit from God was upon Saul, that David took a harp, and played with his hand: so Saul was refreshed, and was well, and the evil spirit departed from him.
All Commentaries on 1 Samuel 16:23 Go To 1 Samuel 16
Augustine of Hippo
AD 430
You, a man of the church, ought to be better instructed by the music of the church than by Pythagoras. Think what David’s lyre did for Saul, who was harassed by an evil spirit but recovered from this disturbance when the holy man played his lyre; beware of thinking the concupiscence of the flesh is a good merely because it is sometimes checked by musical sounds.