Plato, Laws 700d

ταῦτʼ οὖν οὕτω τεταγμένως ἤθελεν ἄρχεσθαι τῶν πολιτῶν τὸ πλῆθος, καὶ μὴ τολμᾶν κρίνειν διὰ θορύβου· μετὰ δὲ ταῦτα, προϊόντος τοῦ χρόνου, ἄρχοντες μὲν τῆς ἀμούσου παρανομίας ποιηταὶ ἐγίγνοντο φύσει μὲν ποιητικοί, ἀγνώμονες δὲ περὶ τὸ δίκαιον τῆς Μούσης καὶ τὸ νόμιμον, βακχεύοντες καὶ μᾶλλον τοῦ δέοντος κατεχόμενοι ὑφʼ ἡδονῆς, κεραννύντες δὲ θρήνους τε ὕμνοις καὶ παίωνας διθυράμβοις, καὶ αὐλῳδίας δὴ ταῖς κιθαρῳδίαις μιμούμενοι, καὶ πάντα εἰς πάντα συνάγοντες,

In the matter of music the populace willingly submitted to orderly control and abstained from outrageously judging by clamor; but later on, with the progress of time, there arose as leaders of unmusical illegality poets who, though by nature poetical, were ignorant of what was just and lawful in music; and they, being frenzied and unduly possessed by a spirit of pleasure, mixed dirges with hymns and paeans with dithyrambs, and imitated flute-tunes with harp-tunes, and blended every kind of music with every other;