Bach, Prelude in A minor, BWV 931, Organ
In music, a prelude is a short instrumental piece with no particular shape or structure. During the Baroque era, the prelude served as an introduction to a longer and more complex work, such as a fugue or a dance suite. Johann Sebastian Bach, along with Johann Pachelbel, were two leading composers who wrote several preludes as preparation to their longer works. Bach's Well-Tempered Clavier is an important example of this type. Here is the eighth prelude from Bach's nine little preludes BWV 931 for organ.