Hans Bischoff (1852-1889) was a German concert pianist and well-regarded music editor, who continues to be respected for his thorough research, attention to detail, and careful consideration of source materials. This newly engraved edition of the Chromatic Fantasy and Fugue, BWV 903 is based on Bischoff's analysis of several documents, including a 1730 manuscript belonging to the Berlin Royal Library. Bischoff's footnotes and prefatory commentary have been preserved, as well as his interpretive