Plato, Laws 700a

λέγεις εὖ· πειρῶ δʼ ἔτι σαφέστερον ἡμῖν σημῆναι τὸ νῦν λεγόμενον. ἔσται ταῦτα. οὐκ ἦν, ὦ φίλοι, ἡμῖν ἐπὶ τῶν παλαιῶν νόμων ὁ δῆμός τινων κύριος, ἀλλὰ τρόπον τινὰ ἑκὼν ἐδούλευε τοῖς νόμοις. ποίοις δὴ λέγεις; τοῖς περὶ τὴν μουσικὴν πρῶτον τὴν τότε, ἵνα ἐξ ἀρχῆς διέλθωμεν τὴν τοῦ ἐλευθέρου λίαν ἐπίδοσιν βίου. διῃρημένη γὰρ δὴ τότε ἦν ἡμῖν ἡ μουσικὴ κατὰ εἴδη τε

Well said! Try, however, to make your meaning still more clear to us. I will. Under the old laws, my friends, our commons had no control over anything, but were, so to say, voluntary slaves to the laws. What laws do you mean? Those dealing with the music of that age, in the first place,—to describe from its commencement how the life of excessive liberty grew up. Among us, at that time, music was divided into various classes and styles: