Plato, Laws 673b

τὸ δὲ τῆς μουσικῆς, ὃ νυνδὴ σχεδὸν ἥμισυ διεληλυθέναι τῆς χορείας εἴπομεν καὶ διαπεπεράνθαι, καὶ νῦν οὕτως εἰρήσθω· τὸ δʼ ἥμισυ λέγωμεν, ἢ πῶς καὶ πῇ ποιητέον; ὦ ἄριστε, Κρησὶν καὶ Λακεδαιμονίοις διαλεγόμενος, μουσικῆς πέρι διελθόντων ἡμῶν, ἐλλειπόντων δὲ γυμναστικῆς, τί ποτε οἴει σοι πότερον ἡμῶν ἀποκρινεῖσθαι πρὸς ταύτην τὴν ἐρώτησιν; ἀποκεκρίσθαι ἔγωγʼ ἄν σε φαίην σχεδὸν ταῦτʼ

Quite rightly. As to music, which was referred to when we said a moment ago that the one half of choristry had been described and disposed of,—let us say the same of it now; but as to the other half, are we to speak about it, or what are we to do? My good sir, you are conversing with Cretans and Lacedaemonians, and we have discussed the subject of music; what reply, then, to your question do you suppose that either of us will make, when the subject left still untouched is gymnastic? You have given me a pretty clear answer, I should say,