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Op. 10 No 2, Etude in A minor

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b. 20

composition: Op. 10 No 2, Etude in A minor

e1-b1 in CLI & Ap

b1 & 2 in FEcor

b1 in FE (→GE,EE)
..

The version of CLI and Ap is certainly earlier. Chopin must have deleted e1 already in the base text for FE. The fact that it cannot be a mistake is proved by the fingering digit (2) written under b1 in FEcor (overlooked in finished FE and the remaining editions). Cf. bars 22 and 24. 

category imprint: Differences between sources

issues: Accompaniment changes , Authentic corrections of FE

b. 20

composition: Op. 10 No 2, Etude in A minor

d-a-c1 in CLI (interpretation)

c-a-b in Ap

d-a-b in FE (→GE,EE) 
..

In the sources there are three enharmonically different forms of this chord. Two of them are inaccurately written: in CLI there are no flats lowering d to d and a to a and in FE there is no  lowering d to d (which was corrected both in GE and EE). In the main text we give the notation adopted by Chopin in the version for publication. Cf. bar 22.

category imprint: Differences between sources; Corrections & alterations

issues: Accidentals in different octaves , Chopin's hesitations , Omission of current key accidentals , Accompaniment changes , Enharmonic corrections

b. 21-23

composition: Op. 10 No 2, Etude in A minor

..

In CLI and Ap there are no cautionary naturals before bass notes at the beginning of bars 21 and 23: before D in CLI and before D and E in Ap.  

category imprint: Differences between sources

issues: Cautionary accidentals

b. 21-22

composition: Op. 10 No 2, Etude in A minor

c1 in chords in CLI & FE (→GE,EE) 

d1 in Ap
..

The octave chords in Ap constitute, as it seems, only a transitional modification of the initial concept of seventh chords. Cf. bars 23-24.

category imprint: Differences between sources; Corrections & alterations

issues: Chopin's hesitations , Accompaniment changes

b. 21

composition: Op. 10 No 2, Etude in A minor

..

We add a cautionary  before a on the 2nd beat of the bar. The addition was already made in GE3 (→GE4→GE5).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions