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Op. 10 No 1, Etude in C major

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b. 38

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

f w CLI & FE (→GE)

g in GE
..

G in GE is a mistake (it was corrected only in GE5) drawn from the review copy of FE, which is proved by the visible traces of the note's deletion in FE.

category imprint: Differences between sources

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

b. 38

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

d1-f1 in CLI

f1 in FE (→GE,EE) 
..

The third of CLI, impossible from the pianistic point of view, is certainly a result of the copyist's distraction, who forgot to erase the erroneously written d1. 

category imprint: Interpretations within context; Differences between sources

issues: Errors of CLI

b. 38

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

..

In CLI there is no cautionary  before f3. 

category imprint: Source & stylistic information

issues: Cautionary accidentals

b. 39

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

Octave in CLI

D in FE (→GE,EE) 
..

The octave in CLI is the original version (see bar 39). Chopin changed it for a single D note, most probably preparing the working autograph of the Etude – [AI] for publication. 

category imprint: Differences between sources

issues: Accompaniment changes

b. 39

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

Octave in CLI

C in FE (→GE,EE) 
..

The octave in CLI is the original version, most probably changed by Chopin during the preparations of the Etude for print (cf. bar 37). 

category imprint: Differences between sources

issues: Accompaniment changes