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Op. 29, Impromptu in A♭ major

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b. 48

composition: Op. 29, Impromptu in A♭ major

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Before the last small note in A, FE and EE there is no natural raising b1 into b1. This obvious oversight was corrected in GE.

category imprint: Differences between sources

issues: GE revisions , Omission of current key accidentals

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. 48

composition: Op. 29, Impromptu in A♭ major

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In A (→GE) and FE there is a natural before d2. We delete the sign which is unnecessary in this context. In EE there is no natural.

category imprint: Differences between sources; Editorial revisions

b. 49

composition: Op. 29, Impromptu in A♭ major

 
 
 
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We adopt the version of A (→GE). The version of FE is probably also authentic, which can be indicated by the fingering of FEJ. On the other hand, the version of EE is most probably a result of an error, similarly as the version of the 1st chord bar 50. 

category imprint: Differences between sources

b. 49

composition: Op. 29, Impromptu in A♭ major

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We add a cautionary flat next to a. The addition was already added in GE.

category imprint: Differences between sources; Editorial revisions

issues: GE revisions