Plato, Laws 668b

ὡς σπουδαίαν, εἴ τις ἄρα που καὶ γίγνοιτο, ἀλλʼ ἐκείνην τὴν ἔχουσαν τὴν ὁμοιότητα τῷ τοῦ καλοῦ μιμήματι. ἀληθέστατα. καὶ τούτοις δὴ τοῖς τὴν καλλίστην ᾠδήν τε ζητοῦσι καὶ μοῦσαν ζητητέον, ὡς ἔοικεν, οὐχ ἥτις ἡδεῖα ἀλλʼ ἥτις ὀρθή· μιμήσεως γὰρ ἦν, ὥς φαμεν, ὀρθότης, εἰ τὸ μιμηθὲν ὅσον τε καὶ οἷον ἦν ἀποτελοῖτο. πῶς γὰρ οὔ; καὶ μὴν τοῦτό γε πᾶς ἂν ὁμολογοῖ περὶ τῆς μουσικῆς, ὅτι πάντα τὰ περὶ αὐτήν ἐστιν ποιήματα μίμησίς τε

is important) and prefer that which possesses similarity in its imitation of the beautiful. Very true. Thus those who are seeking the best singing and music must seek, as it appears, not that which is pleasant, but that which is correct; and the correctness of imitation consists, as we say, in the reproduction of the original in its own proper quantity and quality. Of course. And this is certainly true of music, as everyone would allow,—that all its productions are