One of the best-known Tuvan throat-singers - 'Huun-Huur-Tu' group will participate in the cultural program of 'Golden Mask' Theatre Awards ceremony, Russian 'Vedomosti' paper reports. 'Golden Mask' is one of the most appreciated Russian theatre awards, and among nominants of this year's ceremony is Pina Bausch's 'Der Fensterputzer' (The Window Washer), which was nominated 'Best Foreign Play'. Among participants of the ceremony are such stars as Sergey Starostin, Vladimir Volkov, Leonid Fedorov and Trey Gunn from King Crimson. Opening of 'Golden Mask' will anticipate special event - play of the well-known Russian performance of Leo Dodin's 'Brothers and Sisters' - the play that turns 20 this year.