Musicians perform during a music festival at a grotto of the Longyou grotto scenic spot in Longyou County, east China's Zhejiang Province, Oct. 14, 2020. A four-day music festival, comprised of three music shows held in grottoes, an outdoor music activity and an academic symposium, kicked off at the Longyou grotto scenic spot on Wednesday. (Xinhua/Huang Zongzhi)