BEIJING, May 1, 2016 (Xinhua) -- Members of a South Korean group EXID perform during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Peng Lei (L) and Pang Kuan, members of a rock band New Pants, perform during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Fans cheer during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Singers Song Dongye (L) and Ma Di perform during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Singer Leah Dou performs during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Members of rock band Yaksa perform during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Members of rock band Yaksa perform during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Singer Leah Dou performs during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Singer Leah Dou performs during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Singer Leah Dou performs during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Singer Leah Dou performs during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Singer Leah Dou performs during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)

BEIJING, May 1, 2016 (Xinhua) -- Singer Leah Dou performs during the Strawberry Music Festival in Xianghe County, north China's Hebei Province, April 30, 2016. (Xinhua/Xiao Xiao)