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Op. 27 No 2, Nocturne in D♭ major

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b. 51

composition: Op. 27 No 2, Nocturne in D♭ major

..

We add a cautionary  before c2.

category imprint: Editorial revisions

b. 51-52

composition: Op. 27 No 2, Nocturne in D♭ major

The initial notation of A (  for c flat4 in bar 52)

Naturals added in A 

GE (→FE→EE)
..

A has naturals before the 5th note from the end in bar 51 and the 3rd note of bar 52, which makes  them, respectively, c3 and c4. These naturals were most probably added by a foreign hand (perhaps the reviewer of GE1). Initially, A had only  before the 3rd note of bar 52. Therefore we give that initial version as the version of A, disregarding the improbable change, and we also supplement the omitted   in bar 51. The editions have the unquestionable text with the two flats (c3 and c4) in those places. Cf. bar 55.

category imprint: Interpretations within context; Differences between sources

issues: Foreign hand additions in manuscripts

b. 52

composition: Op. 27 No 2, Nocturne in D♭ major

..

In the ascending part of the run in A (→GE→FE→EE) there is neither  reinstating f3 nor  reinstating a flat3. This is surely a mistake – f flat and a double flat would be binding not only in those places but also in the passage ending the run. Omissions of accidentals in such situations are among Chopin's most frequent mistakes.

category imprint: Differences between sources; Editorial revisions

issues: Omissions to cancel alteration

b. 52

composition: Op. 27 No 2, Nocturne in D♭ major

No cautionary accidentals in A

 in GE1

 and  in FE (-EE) and GE2
..

A has no accidentals before the 4th, 11th and 16th note of the 2nd half of the bar, which results in c3 and twice c flat4. GE has an added http://sm.multimatechopin.com/uploads/ckeditor/images/BEMO.png before the last one of those notes. In the proofing of FE (→EE), and also in GE2 a    was added before c3 and a  moved and placed before the preceding c flat4. According to the rules of chromatic spelling, all those notations result in the same text.

category imprint: Differences between sources

issues: GE revisions , Cautionary accidentals , Authentic corrections of FE

b. 52

composition: Op. 27 No 2, Nocturne in D♭ major

..

When writing A, Chopin overlooked the fact that in the passage ending the run a  is necessary not only before the last note but also four notes earlier in order to lower c3 to c flat3 (or only before that earlier note, depending on the adopted principle for accidentals before notes with an octave sign). The error was corrected in GE (→FE) by moving the  before the fifth note counting from the end of the bar. In EE this corrected notation was supplemented by again adding the sign before the last note.

category imprint: Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions