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Op. 10 No 1, Etude in C major

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b. 7

composition: Op. 10 No 1, Etude in C major

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The cautionary  in front of f is absent in CLI and GE1. The lack of the sign in GE1 suggests that the sign was added only in the last proofreading of FE, which is confirmed by visible traces of introducing changes.

category imprint: Differences between sources

issues: Cautionary accidentals

b. 12-25

composition: Op. 10 No 1, Etude in C major

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The sources differ in the details of notation of accidentals in figures which are repeated in various octaves.
In CLI the  raising d into d is present only in front of the 1st note in bar 22, whereas in bar 25 a  in front of c3 was additionally inserted also in the 4th group of semiquavers.
In FE (→GE1,→EE2,→EE3) there are no  in the 2nd group of semiquavers in bars 12, 22 and 24. In the remaining editions, a  was added in bar 12, while in GE4 (→GE5) also in bars 22 and 24. 

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves

b. 12-25

composition: Op. 10 No 1, Etude in C major

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In CLI all octaves in bars 12-22 and 25 are written in an abbreviated form with the digit 8 under the upper notes. In FE the notation was used only in bars 19-22, while in GE1 (→GE2→GE3) in bars 21-22.

category imprint: Source & stylistic information

issues: Abbreviated octaves' notation

b. 20

composition: Op. 10 No 1, Etude in C major

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In CLI there is no cautionary  before the G1-G octave (written in an abbreviated form as G with 8).

category imprint: Source & stylistic information

issues: Cautionary accidentals

b. 22

composition: Op. 10 No 1, Etude in C major

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CLI has b2 as the 4th semiquaver in the R.H., which results from the logic of the figuration's structure. In FE1 there is a d3, put here by mistake and corrected by Chopin in a proofreading of FE2 (→EE) for b2. The erroneous note must have initially been present also in GE1, which is confirmed by visible traces of its deletion, however, eventually GE1 and all subsequent editions of GE also feature b2.

 

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , Terzverschreibung error , GE revisions , Authentic corrections of FE , Authentic corrections of GE