Persian music is a modal music. It applies a multi-modal system called the dastgâh which presents a macro form for a performance. This form refers to melodic models, each called a gushe, along with rhythmic compositions, including pishdarâmad, charmezrâb, tasnif, and reng. Basically Persian music has been preserved and transmitted through a collection of melodies. These canonical melodies, which serve as models for all compositions and improvisations are organized into a body of music referred to as the radif, including seven dastgâhs and their derivatives.