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. 10 No 7, Etude in C major
In A there is no 
lowering a1 to a1 in the chord on the 2nd quaver of the bar. It is a patent error, comprehensible when we realise that first Chopin wrote the part of the R.H., probably in a half-bar long fragments, and then he wrote the part of the L.H. At the moment of writing the discussed chord, a as an element of the prevailing harmony was already grounded in his awareness. The accidental was added in FE (→GE,EE).
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Accidentals in different octaves, Errors of A, Authentic corrections of FE
notation: Pitch
