Thanks a trillion, Shin. He kindly purchased a great score composed by Master Debussy for Mei-Shun. Since her older book accommodates it loosely, she chose new one among nearly 280 pieces. However, it is amazing to find it ranked C — ranging from easy A to difficult F. Why is Nocturne, Op. 9-2 composed by Master Chopin at E level? Or such an understanding symbolizes her poor technique??