mUltimate Chopin

Op. 10 No 9, Etude in F minor

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b. 8

composition: Op. 10 No 9, Etude in F minor

a in AI, GE & EE

f in A (→FE)
..

The version of A (→FE) is almost certainly erroneous. It is revealed by the notation of AI in this bar and a compatible version of all sources in analogous bar 44. The correct text of GE and EE is most probably a result of revisers' actions, probably on the basis of comparison with bar 44.

category imprint: Differences between sources

issues: EE revisions , Terzverschreibung error , GE revisions , Errors of A

b. 16

composition: Op. 10 No 9, Etude in F minor

..

In AI the minim is written on the level of e1. It is certainly an inaccuracy related to the working nature of the manuscript.

category imprint: Differences between sources

issues: Inaccurate note pitch in A

b. 21-23

composition: Op. 10 No 9, Etude in F minor

..

The sources are missing some of the flats before g notes (in various octaves). None of these inaccuracies raise any doubt concerning the sound intended by Chopin. In AI there are no  before g, as well as before G and g1 in bar 23. In A both flats in the L.H. in the 2nd half of bar 22 are missing; only the first of them was added in FE. The remaining sources have the correct text. 

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in FE , GE revisions , Omission of current key accidentals , Authentic corrections of FE , Inaccuracies in A

b. 25-27

composition: Op. 10 No 9, Etude in F minor

..

In AI Chopin would generally write accidentals only next to the upper notes of the octaves. The only sign before a bottom note is the  lowering g2 to g2 in bar 27. The notation of A is already much more precise – only the  lowering g1 to g1 in bar 25 is missing. FE (→GE,EE) have the correct text.

category imprint: Differences between sources

issues: Accidentals in different octaves , Errors of A , Authentic corrections of FE

b. 26

composition: Op. 10 No 9, Etude in F minor

..

AI is missing the cautionary accidentals before the 1st octave.

category imprint: Differences between sources

issues: Cautionary accidentals