Photo taken on Dec. 19, 2010 shows the art center for Tibetan Opera in Lhasa, capital of southwest China's Tibet Autonomous Region. Artists from Tibetan Opera Troupe rehearsed for the celebration of the 50th anniversary of the founding of the troupe. Tibetan Opera is popular in the Tibetan Autonomous Region as well as Sichuan, Qinghai, Gansu and Yunnan provinces. [Xinhua/Chogo]