Original: The Well-Tempered Clavier, Complete. Prelude and Fugue No. 1 in C major, BWV 846. Prelude and Fugue No. 2 in C minor, BWV 847.
Translation: Prelude and Fugue No. 3 in C-sharp major, BWV 848. Prelude and Fugue No. 4 in C-sharp minor, BWV 849.