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 eloquence does vary both tone and rhythm, expressing sublime thoughts with elevation, pleasing thoughts with sweetness, and ordinary with gentle utterance, and in every expression of its art is in sympathy with the emotions of which it is the mouthpiece.
It is by the raising, lowering or inflexion of the voice that the orator stirs the emotions of his hearers, and the measure, if I may repeat the term, of voice or phrase differs according as we wish to rouse the indignation or the pity of the judge. For, as we know, different emotions are roused even by the various musical instruments, which are incapable of reproducing speech.
Further the
To proceed, an orator will assuredly pay special attention to his voice, and what is so specially the concern of music as this? Here too I must not anticipate a later section of this work, and will content myself by citing the example of Gaius Gracchus, the leading orator of his age, who during his speeches had a musician standing behind him with a pitchpipe, or tonarion as the Greeks call it, whose duty it was to give him the tones in which his voice was to be pitched.
Such was the attention which he paid to this point even in the midst of his most turbulent speeches, when he was terrifying the patrician party and even when he had begun to fear their power. I should like for the benefit of the uninstructed, those
creatures of the heavier Muse,as the saying is, to remove all doubts as to the value of music.