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Op. 10 No 12, Etude in C minor

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b. 12

composition: Op. 10 No 12, Etude in C minor

G in A, GE & EE4

F in FE (→EE3)
..

A has G as the 2nd note in the L.H., same as in the remaining analogous bars. However, the note is written a little bit too low, which probably resulted in its interpretation as F in FE (→EE3). This almost patent error was corrected in GE and EE4.

category imprint: Differences between sources

issues: EE revisions , Errors in FE , GE revisions

b. 14-15

composition: Op. 10 No 12, Etude in C minor

g2 in chord in A

Tied a2 in FE (→EE)

Repeated a2 in GE
..

The d2-g2-d3 chord written at the beginning of bar 15 in A is probably the original version of this place. The version of FE (→EE) was most probably introduced by Chopin at the time of proofreading FE. Lack of the tie sustaining a2 in GE may mean that the element was added only in the last proofreading. While proofreading FE, Chopin also took care of returning a2 in the chord on the 4th beat in the bar. In the main text we add a  also before a1. 

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections of FE

b. 17-18

composition: Op. 10 No 12, Etude in C minor

..

We add a few cautionary accidentals: a  before e in bar 17 and a  before g and  before b in bar 18. The natural was already added in GE2 (→GE3→GE4) and EE4.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , GE revisions

b. 18

composition: Op. 10 No 12, Etude in C minor

No accidental in A

Natural in FE (→GE,EE)
..

Lack of the  returning f is most probably Chopin's oversight here. The composer's concentration may have decreased when, after the chromatised bar 17, he reached the diatonic progression in the main key. In any case, the accidental added in a proofreading of FE (→GE,EE) must be considered to be binding. Similarly in bar 58.  

category imprint: Interpretations within context; Differences between sources

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

b. 26

composition: Op. 10 No 12, Etude in C minor

..

In A there is no cautionary  before c. The accidental was added in a proofreading of FE (→GE,EE). In the main text we add yet another one before the 7th note (in view of the C in the R.H. chord).

category imprint: Differences between sources; Editorial revisions

issues: Cautionary accidentals , Authentic corrections of FE