Plato, Laws 654b

δὲ πεπαιδευμένον ἱκανῶς κεχορευκότα θετέον; τί μήν; χορεία γε μὴν ὄρχησίς τε καὶ ᾠδὴ τὸ σύνολόν ἐστιν. ἀναγκαῖον. ὁ καλῶς ἄρα πεπαιδευμένος ᾄδειν τε καὶ ὀρχεῖσθαι δυνατὸς ἂν εἴη καλῶς. ἔοικεν. ἴδωμεν δὴ τί ποτʼ ἐστὶ τὸ νῦν αὖ λεγόμενον. τὸ ποῖον δή; καλῶς ᾄδει, φαμέν, καὶ καλῶς ὀρχεῖται· πότερον

and the educated man fully choir-trained? Certainly. Choir-training, as a whole, embraces of course both dancing and song. Undoubtedly. So the well-educated man will be able both to sing and dance well. Evidently. Let us now consider what this last statement of ours implies. Which statement? Our words are,—he sings well and dances well: