Chopin: Nocturne No.20 In C Sharp Minor (Ｃｈｏｐｉｎ：　Ｎｏｃｔｕｒｎｅ　Ｎｏ．２０　Ｉｎ　Ｃ　Ｓｈａｒｐ　Ｍｉｎｏｒ)