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b. 26

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

..

The cautionary accidentals before and are our addition.

category imprint: Editorial revisions

b. 27

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

b-g1 in A, GE & EE

b-f1 in FE

..

The version of FE is almost certainly erroneous and it was not repeated either in GE or EE.

category imprint: Differences between sources

issues: EE revisions , Errors in FE , GE revisions

b. 33

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

e1 in A

d1 in FE (→GE,EE)

..

While proofreading FE (→GE,EE), Chopin changed the notation of the bottom note of the 5th and 6th semiquavers from e1 to d1. At the same time, he did not realise that after the change, a  returning d1 in the last pair of semiquavers should be added. The mistake was corrected in GE and EE4.

category imprint: Differences between sources; Corrections & alterations

issues: EE revisions , Errors in FE , Omissions to cancel alteration , GE revisions , Enharmonic corrections , Authentic corrections of FE

b. 33

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

..

We add a cautionary  before c1. The accidental is already present in GE2 (→GE3GE4) and EE4.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , GE revisions

b. 36

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

..

In A there are visible traces of correcting f1-g1 to f1-b1. Cf. bar 3.

category imprint: Corrections & alterations

issues: Corrections in A