One of the three "ostinato" works for organ by the danish Master Dieterich Buxtehude (the others being two Chaconnes: the first, in C Minor, BuxWV 159; the second, in E Minor, BuxWV 160), the Passacaglia, an authentic masterpiece of baroque Music, was passed down to us thanks to the "Hans Andreas Bach Buch", a famous manuscript where it had been copied, and Philipp Spitta's 1875 first volume edition of Dieterich's organ works. Its structure can be understood as being in four sections (D Minor, F Major, A Minor, D Minor) each of which with seven variations. As Walter Kraft once put it, "there is little difference between the chaconne and the passacaglia; the first, however, is a dance, whereas the second is a march; the passacaglia is generally slower and less freely written, and the accent does not fall on the second beat of the bar (as in the chaconne)" (Ap.