The Well-Tempered Clavier, Book II, BWV 870-893 - J.S. Bach: The Well-Tempered Clavier, Book II, BWV 870-893 - Prelude No.4 in C-sharp minor, BWV 873 (该井平均律，第二册，作品870 - 893 - 第四前奏曲升C小调)