BWV 846-869 -24 Präludien und Fugen-Bach's celebrated Das Wohltemperierte Klavier comprehensively reassessed the approach to not only the Keyboard but to diatonic composition in general ultimately revolutionising western music. This special Urtext edition presents the first 24 of the composer's 48 Preludes and Fugues - the works that would eventually define our major/minor harmony system.