Chinese musician Ma Xiaohui (L) performs Erhu, a two-stringed wooden instrument during a concert held at a cathedral in Frankfurt, Germany, on Oct. 3, 2014. Ma Xiaohui gave a concert with two German musicians here on Friday. Photo: Xinhua

Chinese musician Ma Xiaohui performs Erhu, a two-stringed wooden instrument during a concert held at a cathedral in Frankfurt, Germany, on Oct. 3, 2014. Ma Xiaohui gave a concert with two German musicians here on Friday. Photo: Xinhua

Chinese musician Ma Xiaohui reacts after performing Erhu, a two-stringed wooden instrument during a concert held at a cathedral in Frankfurt, Germany, on Oct. 3, 2014. Ma Xiaohui gave a concert with two German musicians here on Friday. Photo: Xinhua

Chinese musician Ma Xiaohui reacts after performing Erhu, a two-stringed wooden instrument during a concert held at a cathedral in Frankfurt, Germany, on Oct. 3, 2014. Ma Xiaohui gave a concert with two German musicians here on Friday. Photo: Xinhua

Chinese musician Ma Xiaohui (L) performs Erhu, a two-stringed wooden instrument, with German violinist Daniel Robert Graf during a concert held at a cathedral in Frankfurt, Germany, on Oct. 3, 2014. Photo: Xinhua

Chinese musician Ma Xiaohui (L) performs Erhu, a two-stringed wooden instrument, with German violinist Daniel Robert Graf(C) and German pianist Carl-Martin Buttgereit(R) during a concert held at a cathedral in Frankfurt, Germany, on Oct. 3, 2014. Photo: Xinhua