Op. 2, Variations in B♭ major
Op. 10, 12 Etudes
Op. 11, Concerto in E minor
Op. 21, Concerto in F minor
Op. 22, Polonaise in E♭ major
Op. 24, 4 Mazurkas
Op. 25, 12 Etudes
Op. 26, 2 Polonaises
Op. 27, 2 Nocturnes
Op. 28, 24 Preludes
Op. 30, 4 Mazurkas
Op. 35, Sonata in B♭ minor
Op. 50, 3 Mazurkas
Op. 63, 3 Mazurkas
Op. 64, 3 Waltzes
Op. 25 No 3, Etude in F major
GC (→GE1) and FE have a 
before b
1 at the beginning of the bar. The sign is unnecessary here, however, it points to Chopin's way of thinking, who probably already here heard the C minor key, prevailing in bars 21-24. The sign was overlooked in EE, which most probably is a result of an oversight (in EE1 the next before a1 is also absent), and deleted in GE2 (→GE3), which is a reasonable revision in this context.
Compare the passage in the sources »
category imprint: Differences between sources
issues: GE revisions
notation: Pitch