Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
But in view of the fact that the study of music has, from those remote times when Chiron taught Achilles down to our own day, continued to be studied by all except those who have a hatred for any regular course of study, it
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would be a mistake to seem to cast any doubt upon its value by showing an excessive zeal in its defence.