Plato, Laws 669d

καὶ ἀνθρώπων καὶ ὀργάνων καὶ πάντας ψόφους εἰς ταὐτὸν οὐκ ἄν ποτε συνθεῖεν, ὡς ἕν τι μιμούμεναι· ποιηταὶ δὲ ἀνθρώπινοι σφόδρα τὰ τοιαῦτα ἐμπλέκοντες καὶ συγκυκῶντες ἀλόγως, γέλωτʼ ἂν παρασκευάζοιεν τῶν ἀνθρώπων ὅσους φησὶν Ὀρφεὺς λαχεῖν ὥραν τῆς τέρψιος. ταῦτά γε γὰρ ὁρῶσι πάντα κυκώμενα, καὶ ἔτι διασπῶσιν οἱ ποιηταὶ ῥυθμὸν μὲν καὶ σχήματα μέλους χωρίς, λόγους ψιλοὺς εἰς μέτρα

a tune or verses of an opposite style. Nor would the Muses ever combine in a single piece the cries of beasts and men, the clash of instruments, and noises of all kinds, by way of representing a single object; whereas human poets, by their senselessness in mixing such things and jumbling them up together, would furnish a theme for laughter to all the men who, in Orpheus’ phrase, have attained the full flower of joyousness. For they behold all these things jumbled together, and how, also, the poets rudely sunder rhythm and gesture from tune, putting tuneless words into meter, or leaving time and rhythm