The Duetto No.4 in A minor, BWV 805, is part of Bach's Clavier-Übung III, a monumental collection of organ works focused on Lutheran catechism. The four duets are unique contrapuntal studies, possibly symbolizing the Four Elements or serving pedagogical purposes.
Composed as part of Bach's Clavier-Übung III, this duet showcases intricate counterpoint and chromaticism. Unlike simpler two-part inventions, it features an elaborate structure with multiple thematic statements and episodes, building dramatic tension through sophisticated modulations before resolving in a powerful cadence.
