subsequently led sui tang theory musical modes ref name lam arabic countries persian countries medieval arabic music theorists include group n ab suf ya'q b al kindi bagdad nbsp ce uses first twelve letters alphabet describe twelve frets five strings oud producing chromatic scale degrees ya ibn al munajjim baghdad author ''ris la f al q '' treatise music ms gb lbl oriental describes pythagorean tuning oud system eight modes perhaps inspired ishaq al mawsili ab n na r mu ammad al f r bi persia
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