Yalli (Kochari, Tenzere), traditional group dances of Nakhchivan, are traditional dances based exclusively on collective performances. Typically, yalli are performed in a circle, chain or line and involve games, pantomime (bird or animal imitations), physical exercises and movements. The dances are performed either spontaneously or in a planned manner during festivities, with free participation being one of the key principles. Several factors currently threaten the transmission of the dances, however, including a shift from informal to formal transmission, a preference for staged performances, labour migration, and drastic simplification of the dances.

on this subject: https://ich.unesco.org/en/USL/01190