Aerial photo taken on April 17, 2018 shows people attending a singing party on the Longmen Mountain in Yatunbao town, Dong autonomous county of Tongdao, Central China's Hunan province. People of Dong ethnic group from Central China's Hunan province, Southwest China's Guizhou province and Yunnan province took part in the singing party together with thousands of visitors around the country. [Photo/Xinhua]