Plato, Laws 834e

ἐν ἀγῶσιν καὶ ὅσα καθʼ ἡμέραν ἐν διδασκάλων ἐκπονούμεθα, πάντως ἤδη πέρας ἔχει. καὶ δὴ καὶ μουσικῆς τὰ μὲν πλεῖστα ὡσαύτως διαπεπέρανται, τὰ δὲ ῥαψῳδῶν καὶ τῶν τούτοις ἑπομένων, καὶ ὅσαι ἐν ἑορταῖς ἅμιλλαι χορῶν ἀναγκαῖαι γίγνεσθαι, ταχθέντων τοῖς θεοῖς τε καὶ τοῖς μετὰ θεῶν μηνῶν καὶ ἡμερῶν καὶ ἐνιαυτῶν, κοσμηθήσονται τότε, εἴτε τριετηρίδες εἴτε αὖ καὶ διὰ πέμπτων ἐτῶν, εἴθʼ ὅπῃ καὶ

by means of contests and of daily teaching. Most of our account of music has likewise been completed; the regulations about rhapsodes, however, and their retinue, and the choral contests which must accompany festivals are matters to be arranged after the gods and demi-gods have had their months, days and years assigned to them; then it will be seen whether they should be biennial fixtures or quadrennial,