Composing 48 keyboard pieces in all 24 keys was the sort of challenge Bach enjoyed. In each of the two parts of The Well-Tempered Clavier he brought together the musical couple prelude and fugue 24 times; twelve in minor keys and twelve in major. In the preludes, he gave free rein to his imagination, and demonstrated mathematical tours de force in the fugues. In contrast to the iron discipline Bach had to apply to his church compositions, here he could abandon himself without worrying about deadlines. This Prelude and Fugue in F is from the first part of the work and dates from 1722, although it contains some music that was written in the preceding five years. Bach described the target group for this collection of pieces as follows: “For both the education of the industrious musical youngster and the enjoyment of those well-versed in this material”.