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Há 20 horas · He also added a fifth string to his oud in the east, as Ziryab had done in the west. [157] Al-Farabi "fully incorporated the works of Aristoxenus and Ptolemy into his theory of tetrachords", and wrote among books in many subjects, the Kitab al-Musiqa al-Kabir , the Major Book of Music , in which he detailed how to tune an oud, using mathematical ratios. [158]
