Book I: Preludes and fugues, BWV 846-869 Preludes and fugues,BWV 846-869 Preludes and fugues BWV 846-857 Preludes and fugues BWV 858-869 3 preludes and fugues, op.36 Preludes and fugues BWV 870-881 Preludes and fugues BWV 882-893 Preludes and fugues, Op. 87