Hao Jiang Tian (L), a veteran Chinese American opera bass singer who has played with New York's Metropolitan Opera for over 20 years, sings a song with Holly Flack at Herbst Theatre in downtown San Francisco, the United States, June 30, 2018. Hao Jiang Tian brought a group of Western tenors and sopranos to San Francisco for the first time on Saturday night to sing some of the most popular Chinese songs in a Western style to nearly 1,000 American and Chinese audience. (Xinhua/Wu Xiaoling)