But in poetry and music there are imitations of manners; and this is evident, for different harmonies differ from each other so much by nature, that those who hear them are differently affected, and are not in the same disposition of mind when one is performed as when another is; the one, for instance, occasions grief 13406 and contracts the soul, as the mixed Lydian: others soften the mind, and as it were dissolve the heart: others fix it in a firm and settled state, such is the power of the Doric music only; while the Phrygian fills the soul with enthusiasm, as has been well described by those who have written philosophically upon this part of education; for they bring examples of what they advance from the things themselves. The same holds true with respect to rhythm; some fix the disposition, others occasion a change in it; some act more violently, others more liberally. From what has been said it is evident what an influence music has over the disposition of the mind, and how variously it can fascinate it: and if it can do this, most certainly it is what youth ought to be instructed in. And indeed the learning of music is particularly adapted to their disposition; for at their time of life they do not willingly attend to anything which is not agreeable; but music is naturally one of the most agreeable things; and there seems to be a certain connection between harmony and rhythm; for which reason some wise men held the soul itself to be harmony; others, that it contains it. CHAPTER VI