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Cassiodorus, Institutiones, 2, 5, 29
IX. Aeolius, phrygium hemitonio, iastium tono, dorium tono semis, hypolydium duobus semis, hoc est diatessaron symphonia; hypophrygium tribus tonis, hypoiastium tribus semis, hoc est diapente symphonia; hypodorium quatuor tonis praecedens.