Izvika (Serbian Cyrillic: извика), Naglas (наглас) or Kajda (кајда) is a traditional polyphonic folk singing in southwestern Serbia, in the Zlatibor region (Užice),^[1] although similar styles are also found in Vlasotince^[2] and other parts of the country. It is sung in a duet. A folk dance, sakajdo, accompanies the singing.^[3]