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b. 15

composition: Op. 10 No 7, Etude in C major

In A (→FE) there is no raising f² to f² at the end of the bar. This patent oversight (cf. similar bar 7) was corrected in GE and EE.

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category imprint: Interpretations within context; Differences between sources

issues: EE revisions , GE revisions , Omission of current key accidentals , Errors of A

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b. 16

composition: Op. 10 No 7, Etude in C major

b² from 7th semiquaver in A

b² on 11th semiquaver in FE (→GE,EE)

The version of A is certainly earlier and was changed by Chopin in a proofreading of FE (→GE,EE). Cf. bar 18, in which this rhythm of harmonic changes was present from the beginning.

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category imprint: Differences between sources

issues: Authentic corrections of FE

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b. 24

composition: 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).