A 15th century treatise on musical theory
written upon the request of Murād II. It is centered on the concept of primary modes (maḳām). With its focus on Zodiac
signs, celestial bodies, the four elements etc., the work is an example of the decline of Systematist theory and
the return to the cosmological tradition. At the end of the work, the author gives a list of 204 secondary modes
(terkīb), 144 of which are his own creation.
