An examination of the role of the pedal clavichord in understanding the work of J. S. Bach, as well as its relevance to contemporary organ performances. Friederich Griepenkerl, in his 1844 introduction to Volume 1 of the first complete edition of J. S. Bach's organ works, wrote: "Actually the six Sonatas and the Passacaglia were written for a clavichord with two manuals and pedal, an instrument that, in those days, every beginning organist...