Interactive piano piece
Learn Prelude Op. 28 No. 21
A broad, cantabile prelude in B-flat major — 58 bars of singing melody above bass octaves that gradually build toward a full, resonant close. Interactive score with tempo slider, section looping, and wait-for-note mode — practice the long bass melody and the cascading right hand separately before merging them.
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Press Play for the full piece, or choose Opening and switch to Wait for note for guided right-hand practice.
About the piece
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.'
Practice path
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.
Score basis: Generated MusicXML from Mutopia MIDI. Public domain composition; Creative Commons Attribution-ShareAlike 4.0; MusicXML generated for Pianodemy. Attribution: Mutopia Project (https://www.mutopiaproject.org/ftp/ChopinFF/O28/Chop-28-21/).
MIDI source: Mutopia Project (https://www.mutopiaproject.org/ftp/ChopinFF/O28/Chop-28-21/). Creative Commons Attribution-ShareAlike 4.0.
Questions
Before you practice.
Short answers for learners and for searchers deciding whether this is the right version to start with.
01How 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.
02What 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.
How to use this V1
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.