Plato's Gorgias begins with a discussion of rhetoric among Socrates, Chaerophon, Polus, Gorgias, and Callicles. Chaerophon is the friend of Socrates which heard the oracle's divination that Socrates is the wisest man at that time, Polus appears to be a student of Gorgias, who is a rhetorician, and Callicles appears to be a statesman.

The discussion leads, according to Socrates, towards the "most important matters" for a man to discuss, and along the way it suggests a moral imperative for poets and performers of music.

I'll leave it to the interested reader to form an opinion about what those "most important matters" are in Socrates' eyes (I'm still figuring that out) as well as how music and other arts fit in.