Pupils play Ansai waist drum during an elective course at No.1 Primary School of Chengguan Township in Qingshuihe County, Hohhot, north China's Inner Mongolia Autonomous Region, May 9, 2019. (Xinhua/Wang Zheng)

Pupils play Ansai waist drum during an elective course at No.1 Primary School of Chengguan Township in Qingshuihe County, Hohhot, north China's Inner Mongolia Autonomous Region, May 9, 2019. (Xinhua/Wang Zheng)

Pupils play Ansai waist drum during an elective course at No.1 Primary School of Chengguan Township in Qingshuihe County, Hohhot, north China's Inner Mongolia Autonomous Region, May 9, 2019. (Xinhua/Wang Zheng)

Pupils play Ansai waist drum during an elective course at No.1 Primary School of Chengguan Township in Qingshuihe County, Hohhot, north China's Inner Mongolia Autonomous Region, May 9, 2019. (Xinhua/Wang Zheng)