Artists with Tibetan Opera Troupe rehearse in Lhasa, capital of southwest China's Tibet Autonomous Region, Dec. 19, 2010. The rehearsal was held to prepare 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]