Li Xin plays the Ocarina, a flute-like instrument, in the fields in Xingtai, north China's Hebei Province, May 14, 2019. Ocarina is a wind musical instrument typically having an enclosed oval body with finger holes and a projecting mouthpiece. It is traditionally made of clay or ceramic, but other materials including wood and horn are used. It is an ancient instrument and can be traced back to many different cultures. (Xinhua/Mu Yu)

Hou Yimin directs students to play the Ocarina, a flute-like instrument, at Longquan primary school in Xingtai, north China's Hebei Province, May 14, 2019. Ocarina is a wind musical instrument typically having an enclosed oval body with finger holes and a projecting mouthpiece. It is traditionally made of clay or ceramic, but other materials including wood and horn are used. It is an ancient instrument and can be traced back to many different cultures. (Xinhua/Mu Yu)

Hou Yimin directs students to play the Ocarina, a flute-like instrument, at Longquan primary school in Xingtai, north China's Hebei Province, May 14, 2019. Ocarina is a wind musical instrument typically having an enclosed oval body with finger holes and a projecting mouthpiece. It is traditionally made of clay or ceramic, but other materials including wood and horn are used. It is an ancient instrument and can be traced back to many different cultures. (Xinhua/Mu Yu)

Hou Yimin (front) directs students to play the Ocarina, a flute-like instrument, at Longquan primary school in Xingtai, north China's Hebei Province, May 14, 2019. Ocarina is a wind musical instrument typically having an enclosed oval body with finger holes and a projecting mouthpiece. It is traditionally made of clay or ceramic, but other materials including wood and horn are used. It is an ancient instrument and can be traced back to many different cultures. (Xinhua/Mu Yu)