For the two hundredth anniversary of the birth of the most influential son of the great Johann Sebastian Bach, Yuval Rabin has taken on a very special project. This Israeli organist who exhaustively studied Bach's instructions for the treatment of repetitions in his doctoral dissertation now puts his findings to the practical test. As Bach saw it, the embellishment of repetitions in no way was limited to highly imaginative improvisation. Instead, a creative compositional process was necessary and presumed a profound understanding of the formal design of the piece and its emotional content. Bach's demand that all modifications "at all times must be, if not better, than at least just as good as the original" has been assimilated by Rabin in special measure. The Stieffell organ in St. Peter's Church in Endingen, an instrument constructed during Bach's lifetime, contributes additional authenticity.