The older type of biphonic singing known as clamor (izvika) belongs to the singing traditions expressed in a heterophonic drone vocal form. Songs are performed by two singers of the same sex or combined male and female singers, and, according to a popular interpretation, the singer who begins the song "takes the lead", "manages", "incises", "gives command", "carves into, while another performer begins to sing slightly later, accompanying the singing of the first singer and “takes it straight forward”. It is important that there is no interruption of the music stream during the performance. These songs are not sung by children, as, due to their age, they do not yet have the necessary physical predispositions (mature, strong, piercing voice, long breath). Based on the lyrics of the songs recorded in the region of Užice, they are classified into songs that accompany women’s and men's work (harvest, mowing, drivers’ songs, those sung during gatherings, shepherds’ songs, etc.), wedding songs and those sung by wedding guests, songs about the homeland, those sung during the celebration of the slava, and love songs. Clamour songs are today performed in everyday life while doing work such as mowing, communal labour, shucking corn, driving, tending cattle, distilling brandy, at weddings, slava celebrations and birthday parties.
Clamour singing is preserved by the local Serbian communities in the Zlatibor District in western Serbia, the villages in the municipalities of Arilje, Bajina Bašta, Ivanjica, Kosjerić, Nova Varoš, Požega, Priboj, Prijepolje, Užice and Čajetina