Bach’s Fantasia and Fugue in A minor (BWV 944) is an incredibly beautiful work for solo keyboard. The opening Fantasia, only ten measures long, requires the soloist to improvise and arpeggiate on the few written chords -- something that Bach, no doubt, could do any day of the week!
The Fugue that follows the short Fantasia is one of Bach’s longest, most energetic and texturally complex fugues. It is derived from his earlier Organ Fugue in A minor (BWV 543).
Sviatoslav Richter’s interpretation of this formidable work is one of my favorites. Listen here.