Prelude and Fugue in A minor, BWV 543

The musical materials of the prelude are a descending chromatic bassline and simple arpeggiated chords above it; this is first stated solo in the manual, and, after a lengthy embellishment of a tonic pedal point, in the pedal. The highly embellished cadence that follows—full of manual runs over sustained pedal notes—leads into a contrapuntal exploration of the opening material in sequence; this is followed by a very free peroration. The Toccata-like prelude—in the stylus phantasticus—bears the marks of Bach's early, north German-influenced style, while the fugue could be considered a later product of Bach's maturity.