Two-time Grammy-winning American violinist Hilary Hahn performs in cooperation with HR-Sinfonieorchester at the Old Opera House in Frankfurt, Germany, on March 20, 2014. (Xinhua/Luo Huanhuan)
Two-time Grammy-winning American violinist Hilary Hahn performs in cooperation with HR-Sinfonieorchester at the Old Opera House in Frankfurt, Germany, on March 20, 2014. (Xinhua/Luo Huanhuan)