Piano sheet music and recordings. This piece is from WTC 1 by Johann Sebastian Bach: Prelude & Fugue BWV 860 No. 15 in G Major (published in 1722) . Level 8, Period: Baroque Prelude & Fugue BWV 860 No. 15 in G Major, by the baroque composer Johann Sebastian Bach. This piano piece was initially published in the year 1722 and is included in WTC 1 by Bach.