mUltimate Chopin

Op. 25 No 11, Etude in A minor

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b. 61-62

composition: Op. 25 No 11, Etude in A minor

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Chopin added cautionary naturals before b in bar 61 and d1 in bar 62 in GC (→GE1); they were added in EE3 too). The second one of them was omitted in GE2, yet returned in GE3. The natural before f1 at the end of bar 61 is an addition, introduced most probably at the time of proofreading of FE. None of these signs are present in EE1 (→EE2).
All sources repeated  before g3 at the beginning of the 4th group of semiquavers in bar 61, while in GC (→GE) and EE also before g in the L.H. EE added also a  before the next g, most probably due to g3 in the R.H. 

category imprint: Differences between sources; Corrections & alterations

issues: Cautionary accidentals , Authentic corrections of FE , Authentic corrections in GC

b. 62

composition: Op. 25 No 11, Etude in A minor

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In GC (→GE1) there is no  before f3 at the beginning of the bar.

category imprint: Differences between sources

issues: GE revisions , Cautionary accidentals

b. 69

composition: Op. 25 No 11, Etude in A minor

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In GE1 there are unnecessary naturals before b3 and a3, yet there is no  lowering b3 to b3. GE2 (→GE3) include the correct notation.

category imprint: Interpretations within context; Differences between sources

issues: Errors in GE , GE revisions

b. 70

composition: Op. 25 No 11, Etude in A minor

Triad in GC (→GE) & EE

Fifth in FE
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Lack of c1 in FE is certainly a mistake. This kind of error suggests that the engraver worked there on the basis of manuscripts and not a proof copy of the already engraved by him first page of the Etude.

category imprint: Differences between sources

issues: Errors in FE

b. 75

composition: Op. 25 No 11, Etude in A minor

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In the 2nd half of the bar the only accidental in the part of the R.H. in GC and FE is a  raising d3 to d3. The notation, although inaccurate, determines also the sound of the 6th and 10th semiquavers in the 2nd half of the bar as d2 and d1. EE added a  before the 3rd semiquaver from the end (d1) and an unnecessary  before g2 in the 3rd group of semiquavers. It is only GE that includes the correct notation, in which alteration of the 3rd, 7th and 11th semiquavers to f3, f2 and f1 was indicated. See bar 11.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , Errors in EE , GE revisions , Omission of current key accidentals