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. 28 No. 21, Prelude in B♭ major
The sources do not contain an accidental before the top note of the third on the 4th quaver in the bar, as a result of which it should be interpreted as e-g
. It must be Chopin's inadvertence – the characteristic f(-d1) – e-g – e-a sequence appears 10 times throughout the Prelude (excluding this place), always with g, even when it is preceded by a g-e sixth (in b. 41). Analogous sequences are to be found on a number of occasions also in other harmonic contexts, always with a minor third on the second quaver. Therefore, Chopin was fully entitled to consider the 
to be obvious in this place.
Compare the passage in the sources »
category imprint: Interpretations within context; Editorial revisions
issues: Omissions to cancel alteration, Errors of A, Errors repeated in GE, Errors repeated in FE, Errors repeated in EE
notation: Pitch
