Chopin’s Prelude in B-flat Major, Op. 28 No. 21 is a lyrical Romantic prelude with a calm, singing character. The music is marked Cantabile, meaning it should be played in a singing style. The right hand often carries long melodic tones and expressive chordal writing, while the left hand supports with steady broken-chord motion. The main challenge is to keep the accompaniment smooth and even while shaping the melody with warmth and patience.

Measures 1–8 introduce the main cantabile texture. The right hand sings long, sustained notes while the left hand moves in flowing broken patterns underneath. The piano dynamic and long slurs create a gentle, spacious opening that should sound calm and expressive.

Measures 9–16 continue the same lyrical idea with more harmonic color. The melody stretches across long phrases, while the left hand keeps the motion steady. The gradual crescendos and diminuendos help the music breathe naturally.

Measures 17–24 grow into a fuller sound. The right hand becomes more chordal, and the music reaches a forte marking while the left hand continues its flowing accompaniment. This section should sound broader and more expressive without becoming heavy.

Measures 25–31 return to a very soft character. The pp marking creates a more delicate and inward sound, and the repeated broken patterns continue quietly underneath the sustained upper notes.

Measures 32–39 bring a more singing and expressive middle section, marked cantato. The right hand becomes more active with shaped melodic figures, while the left hand continues to support with smooth motion. The music grows toward a stronger forte passage near the end of this section.

Measures 40–44 form the most intense part of the prelude. The texture becomes fuller, the dynamics grow, and the harmony becomes more dramatic. The pianist should keep the sound rich and controlled while allowing the phrase to build naturally.

Measures 45–50 begin to soften and return toward the lyrical character. The music moves through a diminuendo and settles into a sweeter dolce sound. This section feels like the tension is slowly releasing.

Measures 51–end close the prelude with a gentle return of the flowing accompaniment and a final stronger cadence. The music remains expressive and warm, then ends with firm accented chords that give the piece a clear and satisfying close.

Interesting fact: Chopin’s Op. 28 No. 21 is one of the more lyrical preludes in the set. Its beauty comes from the contrast between a calm singing melody and a quietly moving accompaniment, showing how Chopin could create deep expression without dramatic speed or large-scale virtuosity.