People of the Zhuang ethnic group sing at a celebration for a traditional festival in Wuming County, southwest China's Guangxi Zhuang Autonomous Region, April 8, 2008. The festival, which falls on March 3 of the Chinese traditional lunar calendar, is celebrated by many nationalities including Zhuang in various ways. With more than 19 million people, Zhuang is the most populous ethnic group in China. (Xinhua Photo)