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b. 19

composition: Op. 27 No 1, Nocturne in C# minor

No sign in GE (→FE)

in EE

..

EE is the only source in which the crescendo marking appears. It is certainly a revision by analogy with bar 7, first of a few of this kind (bars 20, 23, 24, 86 & 90).

category imprint: Differences between sources

issues: EE revisions

b. 20

composition: Op. 27 No 1, Nocturne in C# minor

Slur ending in GE (→FE)

Slur ending in EE

..

The limitation of the slur in EE only to the 1st half of the bar was surely linked with a misinterpretation of the subsequent slurs in this phrase.

category imprint: Differences between sources

issues: EE revisions

b. 20-21

composition: Op. 27 No 1, Nocturne in C# minor

Slurs in GE (→FEEE), literal reading

Slurs in GE (→FEEE), natural interpretation

Our proposition

..
Bar 21 appears at the beginning of the system in GE (→FEEE); this is most probably the reason why the notation of slurs at the juncture of bars 20-21 is unclear. The curved line running from f sharp2 in bar 20 seems to be a tie, yet its ending in bar 21 is missing. Instead, bar  21 contains a line that clearly suggests a continuation of some phrasing slur from bar 20; as a result,  a single phrasing slur from the minim f sharp2 to b sharp1should be considered the only natural interpretation of both those lines. Still, a comparison with similar bars 25-26 and 91-92 makes one conclude that the notation of bar 21 is most probably erroneous, and that Chopin did not intend the slurring in that fragment to differ from the slurring found in its later repetitions. 

category imprint: Graphic ambiguousness

issues: Inaccuracies in GE

b. 20-21

composition: Op. 27 No 1, Nocturne in C# minor

Fingering in FED

No teaching fingering provided

category imprint: Differences between sources

issues: Annotations in teaching copies , Annotations in FED

b. 20

composition: Op. 27 No 1, Nocturne in C# minor

No sign in GE (→FE)

in EE

..

In the sources, the diminuendo sign appears only in EE.

category imprint: Differences between sources

issues: EE revisions