Participants sing in a chorus performance in Kunming, capital of southwest China's Yunnan Province, Sept. 22, 2019. A total of 3,500 participants took part in a chorus performance here on Sunday to celebrate the upcoming National Day. (Xinhua/Hu Chao)

Participants sing in a chorus performance in Kunming, capital of southwest China's Yunnan Province, Sept. 22, 2019. A total of 3,500 participants took part in a chorus performance here on Sunday to celebrate the upcoming National Day. (Xinhua/Hu Chao)

Participants sing in a chorus performance in Kunming, capital of southwest China's Yunnan Province, Sept. 22, 2019. A total of 3,500 participants took part in a chorus performance here on Sunday to celebrate the upcoming National Day. (Xinhua/Hu Chao)

Participants sing in a chorus performance in Kunming, capital of southwest China's Yunnan Province, Sept. 22, 2019. A total of 3,500 participants took part in a chorus performance here on Sunday to celebrate the upcoming National Day. (Xinhua/Hu Chao)

Participants sing in a chorus performance in Kunming, capital of southwest China's Yunnan Province, Sept. 22, 2019. A total of 3,500 participants took part in a chorus performance here on Sunday to celebrate the upcoming National Day. (Xinhua/Hu Chao)

Participants sing in a chorus performance in Kunming, capital of southwest China's Yunnan Province, Sept. 22, 2019. A total of 3,500 participants took part in a chorus performance here on Sunday to celebrate the upcoming National Day. (Xinhua/Hu Chao)