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b. 123

composition: (Op. 4), Sonata in C minor, Mvt I

..

In the main text we omit the unnecessarily repeated  to f3 in the penultimate third, present in all sources.

category imprint: Editorial revisions

issues: Cautionary accidentals

b. 123-124

composition: (Op. 4), Sonata in C minor, Mvt I

..

In A sharps to the bass octaves at the beginning of these bars are only next to the top notes. The remaining necessary accidentals were added by GE (→FE,EE,IE).

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , GE revisions , Inaccuracies in A

b. 124

composition: (Op. 4), Sonata in C minor, Mvt I

f2-a2 in A & FE

f2-a2 in GE (→EE,IE)

..

It is difficult to say what prompted the people working on GE (→FE,EE,IE) to add a  raising f2 to f2. Perhaps the missing  to the bottom note in the next third, which results in e2 when interpreted literally, confused the engraver or the reviser.

It is difficult to say what prompted the people working on GE (→FE1,EE,IE) to add a  raising f2 to f2. Perhaps the missing  to the bottom note in the next third, which results in e2 when interpreted literally, confused the engraver or the reviser. The erroneous accidental was removed only by #FE2, perhaps after comparing it with analogous bar 126, in which f2 is impossible due to f1 in the L.H. sequence of thirds.

category imprint: Differences between sources

issues: Errors in GE , GE revisions , FE revisions , Errors repeated in EE

b. 124

composition: (Op. 4), Sonata in C minor, Mvt I

..

In A (→GEEE1,IE) there is no accidental to the bottom note of the 1st third in the 2nd half of the bar, which results in e2. What is more, 2 quavers later we see a  to e2, which seems to confirm e2 in this place. Nevertheless, the L.H. chord featuring e1 as the topmost note, played simultaneously, points to Chopin's patent mistake. It was noticed and corrected only in FE and EE2. Incidentally, a similar situation in A in analogous bar 126 was corrected already in GE.
In the main text we add a necessary  to the 5th quaver and omit the accidental to the 7th quaver, which is no longer necessary in this context.

category imprint: Interpretations within context; Differences between sources

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

b. 125-126

composition: (Op. 4), Sonata in C minor, Mvt I

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As in previous bars, the accidentals in A are inaccurate. Chopin did not write two necessary naturals in bar 126 – to the bottom note of the 5th quaver (e2) and the 8th quaver (a1). On the other hand, a few accidentals were unnecessarily repeated – the naturals to f3 and e3 at the end of bar 125 and to a2 at the end of bar 126. In addition, after adding the missing  to the 5th quaver in bar 126, the  to the 7th quaver becomes superfluous. In GE (→FE,EE,IE) only the missing accidentals were added. In the main text we add the necessary accidentals and omit the superfluous repetitions.

category imprint: Interpretations within context; Differences between sources

issues: GE revisions , Cautionary accidentals , Omission of current key accidentals , Errors of A