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Cassiodorus Cassiodorus, Institutiones, 2, 5, 30
X. Lydius est aeolium hemitonio, phrygium tono, iastium tono semis, dorium duobus tonis, hypolydium duobus semis tonis, hoc est, diatessaron symphonia: hypoaeolium tribus tonis, hypophrygium tribus semis tonis, hoc est diapente symphonia; hypoiastium quatuor tonis, hypodorium quatuor semis tonis praecedens.

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