Prelude & Fugue in G-sharp Minor BWV 863 No. 18 by Johann Sebastian Bach. Sheet music and recordings of thousands of piano pieces by Johann Sebastian Bach and many other famous composers to view in your digital device, print out or listen to. Prelude & Fugue in G-sharp Minor - BWV 863 No. 18 is a piece by the baroque composer Johann Sebastian Bach. The composition was first published in 1722 and is included in WTC 1 by Bach.