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b. 38-40

composition: Op. 10 No 3, Etude in E major

..

In order to facilitate the interpretation of chromatic progressions, we add a number of cautionary and reminding signs. Only a part of them are in the sources; it also happens that the sources have different signs of this type, which are, according to us, superfluous.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , GE revisions , Cautionary accidentals

b. 38

composition: Op. 10 No 3, Etude in E major

..

The bottom note of the 2nd semiquaver is written in AI as e, while before the bottom note of the next semiquaver there is no  returning e. In the context of a more precise notation of the later sources, the lack of  must be considered as a mistake, in spite of the fact that from the purely harmonic point of view, the version with the repeated e would not be entirely impossible (although rather not in the stylistics of young Chopin, who showed a clear preference for diminished four-note chords). In A one can see traces of change of this e to f. Cf. the Prelude in C minor, Op. 45, bar 79

category imprint: Differences between sources; Corrections & alterations

issues: Enharmonic corrections

b. 38

composition: Op. 10 No 3, Etude in E major

..

Before the top note on the 7th semiquaver, the  returning f is only in GE4 (→GE5). It means the sound of f in AI and in the aforementioned GE, and in the remaining sources. However, there is no doubt that the missing  is Chopin's oversight, related to the correction on the 2nd semiquaver.

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors resulting from corrections , GE revisions , Errors of A

b. 39

composition: Op. 10 No 3, Etude in E major

Fingering written into FES

No teaching fingering 

..

In the main text we give the fingering coming probably from Chopin, introduced in FES. See bar 41

category imprint: Differences between sources

issues: Annotations in teaching copies , Annotations in FES

b. 39

composition: Op. 10 No 3, Etude in E major

..

In FE (→GE,EE) there is no fingering digit for the bottom note (1).

category imprint: Differences between sources

issues: Errors in FE