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b. 36

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

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In A there are visible traces of adjustments of the 2nd and 3rd quavers. The removed version could have been the following: .

category imprint: Corrections & alterations

issues: Corrections in A

b. 37-39

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

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A (→FEEE,GE1GE2) has naturals before b1, the upper note of the last semiquaver in bars 38-39. The unnecessary accidentals were removed in GE3 (→GE4), yet adding a  before b1 at the end of bar 37, more justified from the formal point of view. Moreover, in the sources there is also an unnecessary  before the first c1 in bar 38. In the main text we do not include any of these signs.

category imprint: Differences between sources

issues: GE revisions , Cautionary accidentals , Last key signature sign

b. 40

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

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In A there is no  returning c1 in the chord on the 4th quaver in the bar. This evident oversight by Chopin was corrected in FE (→GE,EE).

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors of A , Authentic corrections of FE

b. 42

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

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We add a cautionary  before c3 at the end of the bar. The addition was already performed in GE2 (→GE3GE4).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 48-51

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

..

In A there is no  before the bottom note of the last octave in bar 48. The  and the  before the bottom notes of the 4th and 5th octaves in bar 51 are also missing. These patent oversights were corrected in FE (→GE,EE).

category imprint: Differences between sources

issues: Accidentals in different octaves , Authentic corrections of FE , Inaccuracies in A