Fantasie "duobus subiectis" in G minor, BWV 917

I once had a thought of composing a piece with two simultaneous subjects, but before I could come up with anything, I came across this piece by Bach in his twenties. After the short, improvisatory introduction, Bach immediately presents the two — or, if we include the soprano, three — subjects and his mastery of invertible counterpoint. ~~~~~~~~~~ Fantasie "duobus subiectis" in G minor, BWV 917 by Johann Sebastian Bach (1685–1750) Piano: Ruoshi Sun (2026) on CLP-785 Temperament: Werckmeister