Boys and girls sing during a charity performance held by Silicon Valley Youth Orchestra and Silicon Valley Youth Performing Arts in San Jose, California, the United States, June 9, 2018. A charity performance to raise fund for charity groups which provide aids to blind children or special needs was held here on Saturday. (Xinhua/Wu Xiaoling)

Children perform during a charity performance held by Silicon Valley Youth Orchestra and Silicon Valley Youth Performing Arts in San Jose, California, the United States, June 9, 2018. A charity performance to raise fund for charity groups which provide aids to blind children or special needs was held here on Saturday. (Xinhua/Wu Xiaoling)

Girls dance during a charity performance held by Silicon Valley Youth Orchestra and Silicon Valley Youth Performing Arts in San Jose, California, the United States, June 9, 2018. A charity performance to raise fund for charity groups which provide aids to blind children or special needs was held here on Saturday. (Xinhua/Wu Xiaoling)

Boys and girls perform during a charity performance held by Silicon Valley Youth Orchestra and Silicon Valley Youth Performing Arts in San Jose, California, the United States, June 9, 2018. A charity performance to raise fund for charity groups which provide aids to blind children or special needs was held here on Saturday. (Xinhua/Wu Xiaoling)

Musicians play cellos during a charity performance held by Silicon Valley Youth Orchestra and Silicon Valley Youth Performing Arts in San Jose, California, the United States, June 9, 2018. A charity performance to raise fund for charity groups which provide aids to blind children or special needs was held here on Saturday. (Xinhua/Wu Xiaoling)

Singers sing during a charity performance held by Silicon Valley Youth Orchestra and Silicon Valley Youth Performing Arts in San Jose, California, the United States, June 9, 2018. A charity performance to raise fund for charity groups which provide aids to blind children or special needs was held here on Saturday. (Xinhua/Wu Xiaoling)

Russian violinist Haik Kazazyan plays violin with Silicon Valley Youth Orchestra during a charity performance held by Silicon Valley Youth Orchestra and Silicon Valley Youth Performing Arts in San Jose, California, the United States, June 9, 2018. A charity performance to raise fund for charity groups which provide aids to blind children or special needs was held here on Saturday. (Xinhua/Wu Xiaoling)

A dancer performs during a charity performance held by Silicon Valley Youth Orchestra and Silicon Valley Youth Performing Arts in San Jose, California, the United States, June 9, 2018. A charity performance to raise fund for charity groups which provide aids to blind children or special needs was held here on Saturday. (Xinhua/Wu Xiaoling)