A highlight of the musical encounter between Western and Eastern styles is the performance by Duo Dong West, consisting of Vivian Lee (vocals) and Volker Greve (piano, percussion), with their program of ethnic jazz and traditional sounds. The singer and musician Chen Ning will sing arias from the classical opera repertoire as well as the 1960s and '70s in German and Chinese. As a connoisseur of the Beijing Opera, he will explain the roles of various characters of this musical theater and will demonstrate the gestures, masks, and costumes. Demonstrations of instruments such as the guqin and hulusi along with explanations will provide insight into the cultural and historical significance of the Chinese musical tradition. The introductory courses to Chinese language will also focus on music in the form of rhymes and folk songs. The Moon Festival, which is celebrated in China on the last weekend in September, will also be featured in the musical program at the Day of Confucius Institutes.