Lucian De saltatione 72

[72] Then why is not dancing a thing of utter harmony, putting a fine edge upon the soul, disciplining the body, delighting the beholders and teaching them much that happened of old, to the accompaniment of flute and cymbals and cadenced song and magic that works its spell through eye and ear alike? If it is felicity of the human voice that you seek, where else can you find it or what can you hear that is more richly vocal or more melodious? If it is the high-pitched music of the flute or of the syrinx, in the dance you may enjoy that also to the full. I forbear to mention that you will become better in character through familiarity with such a spectacle, when you see the assembly detesting misdeeds, weeping over victims of injustice, and in general schooling the characters of the individual spectators.

[72] Consider then the universality of this art: it sharpens the wits, it exercises the body, it delights the spectator, it instructs him in the history of bygone days, while eye and ear are held beneath the spell of flute and cymbal and of graceful dance. Would you revel in sweet song? Nowhere can you procure that enjoyment in greater variety and perfection. Would you listen to the clear melody of flute and pipe? Again the pantomime supplies you. I say nothing of the excellent moral influence of public opinion, as exercised in the theatre, where you will find the evil-doer greeted with execration, and his victim with sympathetic tears.