People sing along Songhua River in Harbin, capital of northeast China's Heilongjiang Province, July 31, 2019. Attracted by the coolness in summer, many tourists come to Harbin for vacation. Meanwhile, Harbin is a city of music for the locals who got in touch with European classical music in an earlier time in China. With the cool summer and rich culture, Harbin received 36.23 million tourists and made revenue of 60.7 billion yuan (8.6 billion U.S. dollars) in the summer of 2018. (Xinhua/Xie Jianfei)