Themes > Arts > Music > Music around the World > Persian Classical Music > Compositional Structure
There are three instrumental forms and one vocal form in Persian music. The instrumental forms are pishdaramad, cheharmezrab, and reng. Pishdaramad was invented by a great master of the tar, Darvish Khan, and was inteded as a prelude to the daramad of a dastgah. It may be in duple, triple, or quadruple time, and it draws its melody from some of the important gushehs of the piece. Cheharmezrab is a solo piece, mostly with a fast tempo, and is usually based on the melody immediately preceding it. The third instrumental form is the reng, which is a simple dance piece that is usually played at the conclusion of the dastgah.
The vocal form is called tasnif. It has a design similar to the pishdaramad, and is usually placed immediately before the reng.

Information provided by http://www.duke.edu/~azomorod/persian2.html#D