Prelude and Fugue in D

The D-major pair from Book 1 of The Well-Tempered Clavier (1722) is one of the most extroverted prelude-and-fugue couplings in the cycle. The Prelude is a continuous toccata-like flow of triplets that build to a brilliant cadence; the Fugue is a four-voice essay built on a stately, march-like subject. The pair shows Bach's keyboard writing at its most outward-facing, suited to a confident performer.

Technically the Prelude tests sustained even triplet motion at a brisk tempo with a clear harmonic plan emerging from the figuration. The Fugue tests four-voice playing — the most demanding texture in the 48 — and the student must distribute the four lines between the two hands while keeping each voice's articulation and shape distinct. Hand-distribution decisions for the Fugue must be planned in advance and rehearsed slowly.

Two pitfalls. First, the Prelude's triplet pattern can become mechanical at speed; practise it slowly with attention to the harmonic shifts that the figuration outlines, and the piece will breathe rather than tick. Second, the Fugue's four-voice texture often collapses into a chord progression — students who don't track each voice as an independent line lose the contrapuntal substance. The subject's entries must always be audible above the surrounding texture.

The complete Well-Tempered Clavier is on IMSLP in clean public-domain editions including Bach's autograph. Hearing the D-major pair on harpsichord (the canonical Leonhardt and Tureck recordings remain the reference) calibrates the right cleanly-articulated touch.