More than 500 people from 12 choirs across China sing together on the sloped rooftop of a concert hall in Zhangjiajie, central China's Hunan Province on August 21, 2017/China News Service Photo

It marked the opening ceremony of the upcoming international choir festival week. /China News Service Photo

A choir comprised of monks and nuns, the first of its kind in China, also participated in the competition. /China News Service Photo

A Buddhist choir from central China’s Hubei Province performed during the event. /China News Service Photo