Prelude Op. 28 No. 21
The bass sings, the treble cascades - and neither yields.
Prelude No. 21 in B-flat major follows the stark C minor march of No. 20 like a breath of air, though it brings its own considerable demands. Composed as part of the Op. 28 set finished in Majorca in 1839, it places a long, lyrical melody in the left hand while the right hand fills in cascading triplet arpeggios above - a texture Chopin used in several of his nocturnes but here pressed into a shorter and more intense form.
The contrast with No. 20 is deliberate: where that prelude was slow, vertical, and harmonically static, No. 21 is flowing, horizontal, and restlessly modulating. The B-flat major key feels like resolution after the darkness of C minor. Chopin's student Friedrich Kalkbrenner noted in a letter that No. 21 was one of the preludes Chopin himself played most at private gatherings - 'as if it were improvised on the spot, the left hand leading like a narrator and the right like a running commentary.'
Lead with the left hand - it carries the argument.
The left-hand bass melody is the main voice. Practice it alone first, shaping it as a cello line: legato, with a clear sense of phrase direction and a slight lean on the longer notes. This melody must remain audible when the right-hand triplets are added - and the right hand will instinctively want to dominate because triplets are physically louder.
Once the left hand is secure and singing, add the right-hand triplet arpeggios at a quiet dynamic. The right hand should feel like accompaniment even though it plays nearly all the notes. Section-loop the opening eight bars until the balance is consistent, then build outward to the full piece.
Engraving based on the Mutopia Project edition , licensed Creative Commons Attribution-ShareAlike 4.0.
MIDI based on the Mutopia Project edition , licensed Creative Commons Attribution-ShareAlike 4.0.
Before you practice.
01 How long is Chopin Prelude Op. 28 No. 21?
58 measures - one of the longer pieces in the Op. 28 set. Its sustained arc from a quiet opening to a fuller close makes it feel more like a short movement than a brief sketch.
02 What is the main challenge of Chopin Prelude Op. 28 No. 21?
Balancing the singing right-hand cantabile against left-hand bass octaves, and managing the gradual dynamic growth across the piece without forcing the climax too early.
Right hand quieter than feels possible - left hand forward.
Practice right hand alone at 70% tempo and set it deliberately at a piano dynamic - softer than the left hand will be. Then practice left hand alone at singing mezzoforte. When combining, the ratio of left-louder to right-quieter should feel exaggerated; at full tempo it will sound natural. Pedaling follows the bass note changes: change on each new left-hand note, sustain lightly through the right-hand fill. Wait-for-note mode on the left-hand notes helps fix entries that rush behind the triplet flow.
