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Op. 29, Impromptu in A♭ major

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Issues : Terzverschreibung error

b. 19

composition: Op. 29, Impromptu in A♭ major

 
 
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In GE1 the 9th quaver is g, which is certainly a mistake, a typical mistake of "thirds". In GE2 (→GE3→GE4) the correct text was reinstated. In EE there is a cautionary flat before the appropriate note (e). 

category imprint: Differences between sources

issues: EE revisions , Errors in GE , Terzverschreibung error

b. 64

composition: Op. 29, Impromptu in A♭ major

 
 
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The version of the 2nd half of the bar in A, FE and EE is rather erroneous, so the change inscribed into FEJ should be considered as a correction. The mistakes in the number of ledger lines are Chopin's most frequent errors.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , Terzverschreibung error , GE revisions , Errors in the number of ledger lines

b. 80

composition: Op. 29, Impromptu in A♭ major

 
 
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The sixth c3-a3 present in GE1 (→GE2) is a characteristic mistake of "thirds" made by the engraver (moving the upper note by a third). The corrections in GE3 (→GE4) were probably made after revising the text from A.

category imprint: Differences between sources

issues: Errors in GE , Terzverschreibung error , GE revisions