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. 4), Sonata in C minor
Op. 10 No 2, Etude in A minor
In the sources one or both naturals before the a1-c2 third were omitted. Lack of the 
before a1 (in all sources) is a patent error. What is interesting is the fact that the defect was not corrected in GE and EE4 despite adding a cautionary before a2. In turn, lack of the returning c2 in Ap, although most probably incidental, leads to a version with c
2, which, from the harmonic point of view, is not impossible.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Omissions to cancel alteration
notation: Pitch
