Passengers are seen at the Xuanwumen Station of Beijing Metro Line 4 in Beijing, capital of China, Dec. 3, 2018. On the occasion of the 40th anniversary of China's reform and opening up, the Xinhua News Agency together with Netease Cloud Music held a music theme photo exhibition at the Xuanwumen Station of Beijing Metro Line 4 and Ding'an Road Station of Hangzhou Metro Line 1. Meanwhile, two trains themed with music stories were also launched on the metro lines. The music theme photo exhibition shows the development of Chinese music in the past 40 years and the changes music brings to people's lives through the precious historical photos of the Chinese Photo Archive. (Xinhua/Ju Huanzong)