Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Toccata, Adagio, and Fugue in C Major, BWV 564 is an organ composition by Johann Sebastian Bach, written in 1708 in Weimar. The autograph score simply bears the title "Toccata in C Major", but the piece has become known exclusively by this title. It is unique among Bach''s organ works in interpolating a slow section between the prelude and fugue, although he had apparently been toying with the idea for years - the Prelude and Fugue in C Major BWV 545 exists in an alternate early version (transposed down to B-flat major) with what later turned up as the slow movement from the C major organ sonata.