In Turkish classical music, Mevlevi music, an some Mosque music, a system of melody types called makam (pl. makamlar) provides a complex set of rules for composing. Each makam specifies a unique intervalic structure (cinsler) and melodic development (seyir). Whether a fixed composition (beste, şarkı, peşrev, âyin, etc.) or a spontaneous composition (gazel, taksim, Kuran-ı Kerim, Mevlit, etc.), all attempt to follow the melody type.