Issues : Errors in GE

b. 27

composition: Op. 29, Impromptu in A♭ major

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GE1 is lacking a cautionary natural next to the 10th quaver d in the L.H. 

category imprint: Differences between sources

issues: Errors in GE

b. 29-30

composition: Op. 29, Impromptu in A♭ major

 
 
 
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The sources differ in the number of accents in the L.H. in bars 29-30. In A, GE2, GE3, EE the accents are in bar 29 over the 5th and 11th quaver (f1) and in bar 30 – over the 5th quaver (e1). In GE1 and GE4 there is only an accent in bar 30 over the 5th quaver (e1). In FE there are no accents at all. 

category imprint: Differences between sources

issues: Errors in FE , Errors in GE

b. 38

composition: Op. 29, Impromptu in A♭ major

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In EE the  sign is placed too early, under, and even before the 2nd crotchet of the bar. It is certainly a mistake, similarly as the lack of pedalling in GE.

category imprint: Graphic ambiguousness; Differences between sources

issues: Errors in EE , Errors in GE

b. 48-50

composition: Op. 29, Impromptu in A♭ major

 
 
 
 
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The final fragment of the slur in A is written with panache, so the slur goes to bar 51. However, the shape of the sign clearly advocates for ending the slur in bar 50. In this situation the version of GE must be considered as erroneous.
The slurs in FE and EE probably reflect the original Chopin's notation: the slur in EE is almost entirely compatible with the range of that part of slur in A, which is written with a thicker line (from the 2nd crotchet of bar 49). Therefore, it is possible that Chopin first wrote this part and then completed the initial fragment of the slur.

category imprint: Graphic ambiguousness; Differences between sources; Corrections & alterations

issues: Overextending slur , Errors in GE

b. 53

composition: Op. 29, Impromptu in A♭ major

 
 
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Lack of the  mark in GE is certainly a mistake.

category imprint: Differences between sources

issues: Errors in GE