The present volume is the third of this definitive series consisting of the very first critical edition of the Rasail Arabic, complete with the first fully annotated English translation. Prepared by Professor Owen Wright, Epistle 5: ‘On Music’ presents technical concepts such as rhythm, tone, and metre, alongside more subtle aspects such as the psychological applications drawn from the fourfold theory of humours and the correspondence of numeric proportions, which emphasize the Ikhwan’s view of music as ultimately spiritual in nature.
Ismailimail 
Arab world has rich cultural and especially music heritage so I hope that this book delivers good ammount of information
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