Bach’s Pedal-Exercitium (BWV 598) is a short, complex work for organ pedals. With its fast passages and challenging articulations, the piece is considered a sort of exercise for the developing organist.
The surviving manuscript is in the hand of Bach’s son, Carl Philipp Emanuel. It may simply be a piece that Carl Phillip jotted down as he was listening to his father improvise at the pedals. To add to the mystery, the manuscript does not include an ending. Recent research concludes that this fragment was not a work of J.S. Bach.