Johann Caspar Ferdinand Fischer (c. 1656 – 27 August 1746) was a German Baroque composer. Johann Nikolaus Forkel ranked Fischer as one of the best composers for keyboard of his day, however, partly due to the rarity of surviving copies of his music, his music is rarely heard today.
"Ariadne musica" (also known as Ariadne musica Neo-organoedum, 1702). This is a collection of pipe organ pieces (most written for manuals only or have optional pedal) in two parts:
The first part contains twenty preludes and fugues in nineteen different keys and one in the Phrygian mode based on E. It is considered a significant precursor to Johann Sebastian Bach's The Well-Tempered Clavier. Bach held Fischer's work in high regard.
The second part contains five ricercars based on chorale melodies.
Prelude and Fugue in A minor is the fifteenth of the collection