The Republic by Plato Part 3 Page 43

the words, the melody, and the rhythm; that degree of knowledge I may presuppose?

Yes, he said; so much as that you may.

And as for the words, there will surely be no difference between words which are and which are not set to music; both will conform to the same laws, and these have been already determined by us?

Yes.

And the melody and rhythm will depend upon the words?

Certainly.

We were saying, when we spoke of the subject-matter, that we had no need of lamentation and strains of sorrow?

True.

And which are the harmonies expressive of sorrow? You are musical, and can tell me.