Prelude and Fugue in G-sharp minor, BWV 887

The Prelude and Fugue in G-sharp minor, BWV 887, is the eighteenth prelude and fugue in the second volume of The Well-Tempered Clavier by Johann Sebastian Bach.

[1] The prelude is in common time and has 50 measures.

Starting from measure 61, the second subject appears, which is similar to the countersubject, both in a chromatic scale.

In measure 97, the first and second subject begins to appear together, with the second subject joining one quarter note after, and one octave higher or lower than the first subject; they appeared in total for five times until the end, always in the same form.

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