Album Description2008 three CD digipak. J.S. Bach wrote his Wohltemperiertes Klavier between 1720 and 1740 as study material for his advanced keyboard students. The forty-eight pieces of the Well-tempered Clavier, Bach belonged to the first compositions to twenty-four keys: thanks to a new keyboard tuning technique it had become to change intervals and divide octaves into twelve equal parts. No other collection of works had anything approaching such a influence on the development of music in the centuries that followed The recordings were made in the years 1933 to 1936 by Swiss pianist Edwin Fischer, who became famous with interpretations of the works from Schubert and Schumann. He was leader of the Munich Bachverein as of 1926. Documents.