 Complete the following phrase:  Lei Jia has visited over twenty countries to participate in various cultural exchange activities and help introducing Chinese folk music to the world. In the prelude leading to the 2008 Beijing Summer Olympics, Lei Jia participated in The Songs of the 56 Chinese Nationalities Music Torch Relay. This was a unique project that included a compilation of fifty-six folk songs from the fifty-six ethnic groups of China. Lei Jia was given the role of lead singer in this event. At the 