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Cassiodorus Cassiodorus, Institutiones, 2, 5, 28
VIII. Phrygius est iastium hemitonio, dorium tono, hypolydium tono semis, hypoaeolium ditono, hypophrygium duobus semis tonis, hoc est diatessaron symphonia; hypoiastium tribus tonis, hypodorium tribus semis tonis hoc est diapente, symphonia praecedens.

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