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Didymos :''For the asteroid, see 65803 Didymos.'' Didymos Greek: Δίδυμος) was an ancient Greek music theorist in the last century before the common era. He was a predecessor of Ptolemy at the library at Alexandria. == Theory == We know of his theory only indirectly from the works of Porphyry and Ptolemy. There one finds examples of his tetrachords as measured string lengths from which the following proportions can be calculated: * diatonic Tetrachord: 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Didymos」の詳細全文を読む
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