What are the musical morphological characteristics of the music department in West Asia and North Africa?

This music department, also called Persian Arabic Music Department, mainly includes parts of West Asia, North Africa and Central Asia, which is roughly equivalent to the so-called Islamic world. In China, Uighurs, Tajiks and Uzbeks mainly use this music system.

The music department of West Asia and North Africa has the following characteristics in music form:

In this music system, the notes are fixed and the notes with cavities are widely used. However, this kind of music with cavity is different from the East Asian Music Department, and is based on the quartile scale of Persian and Arabic traditional music. Specifically, there will be a small second-degree interval moving up and down on the second-degree (34 whole tones) and second-degree (64 whole tones), and a "band cavity" will appear. Therefore, this band cavity can be regarded as a conditional band cavity. Music with tune is the charm of music in West Asia and North Africa.