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b. 56

composition: WN 37, Lento con gran espressione

f in A1, CJCK (→CB)

g in EL

..

The version of EL is probably Kolberg's revision. However, one cannot rule out a mistake (e.g. of the engraver) due to the resemblance of the accompaniment in b. 55-56 and 51-52. 

category imprint: Differences between sources

issues: Revisions in EL

b. 58

composition: WN 37, Lento con gran espressione

..

The 6th L.H. quaver in EL is an a instead of f, which must be a mistake. See the note at the beginning of the bar.

category imprint: Differences between sources

issues: Terzverschreibung error

b. 61-62

composition: WN 37, Lento con gran espressione

e1 in bars 61-62 in A1, CK (→CB) & EL

e1 & e1 in CJ, literal reading

e1 & e1 in CJ, contextual interpretation

..

Out of the two versions coming from [A2], we give priority to CK due to its compliance with the unequivocally authentic version of A1. The sharp raising e1 to e1 in b. 61 in CJ could have been placed by mistake, e.g. due to the resemblance of the figures in b. 61-63. On the other hand, one cannot rule out that Chopin wanted to introduce a major variant of the tonic already in b. 61 – cf. the major endings of the Nocturnes in E Minor, WN 23, C Minor, Op. 27 No. 1, F Minor, Op. 48 No. 2 or F Minor, Op. 55 No. 2, consisting of a few or several dozen bars. 

category imprint: Interpretations within context; Differences between sources; Corrections & alterations

issues: Omission of current key accidentals , Errors of JC , Inaccuracies in JC , Errors in CK

b. 63

composition: WN 37, Lento con gran espressione

..

There is no accidental before the 6th L.H. quaver in A1, CJ 7 CK. The inaccuracy, frequent in Chopin's works, was corrected in CB & EL.

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Inaccuracies in A , Balakirev's revisions , Revisions in EL