A recent genre developed in late Qajar years. Pishdaramad is an instrumental piece with slow tempo functioning as a concert overture. When composing pishdaramad, composers try to employ all modal gushes available in a dastgah or avaz; in other words, he tours between every modes of a dastgah or avaz. Pishdaramad is the sole genre without any equivalents in the corpus of radif. Of its famous examples are pishdaramad in Esfahan, by Morteza Neydavud.
Source: An Introduction to Iraninan music booklet from Mahoor Institute of Culture and Art