Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
So far I have attempted merely to sound the praises of the noblest
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of arts without bringing it into connexion with the education of an orator. I will therefore pass by the fact that the art of letters and that of music were once united: indeed Archytas and Euenus held that the former was subordinate to the latter, while we know that the same instructors were employed for the teaching of both from Sophron, a writer of farces, it is true, but so highly esteemed by Plato, that he is believed to have had Sophron's works under his pillow on his deathbed: