Visitors look at an ancient bell of the Spring and Autumn Period (770 B.C.-476 B.C.) at the exhibition hall in the National Center For the Performing Arts in Beijing, capital of China, Dec. 20, 2010. The Charm of Ancient Chinese Music, an exhibition of music relics in the Central Plain Area, opened here on Monday, displaying various ancient Chinese musical instruments. [Xinhua/Luo Xiaoguang]