Over 3000 people will take part in the world old-believers Forum 'Avvakum's Path' which opens in Ulan-Ude, capital of Buryatia (Russia), on May 31. Among its participants are Tuva's ensembles - 'Oktai' and 'Vereya'. The two dwell their repertoir on the spiritual song of the old believers collected by the young musicians throughout ethnograpic expeditions in the Upper Yenissei.