This is the very first volume of '' Wohltemperiert Klavier ''. Very very very important for all the pianist around the world. It might give us not only technique but a huge knowledge about harmony. From the baroque era, this one of the most important sheet music.
This both volumes fuse the fourty eight ''Prelude and Fugue'', written by Johann Sebastian Bach, the best composer from that time. Bach was such a genius and probably the musician that wrote the biggest reportor ever.
Last but not least, all the tonalities are used, both major and minor ones.