The Republic by Plato Part 3 Page 38

pipes, trumpets, and all sorts of instruments: he will bark like a dog, bleat like a sheep, or crow like a cock; his entire art will consist in imitation of voice and gesture, and there will be very little narration.

That, he said, will be his mode of speaking.

These, then, are the two kinds of style?

Yes.

And you would agree with me in saying that one of them is simple and has but slight changes; and if the harmony and rhythm are also chosen for their simplicity, the result is that the speaker, if he speaks correctly, is always pretty much the same in style, and he will keep within the limits of a single harmony (for the changes are not great), and in like manner he will make use of nearly the same rhythm?