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Op. 29, Impromptu in A♭ major

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b. 17

composition: Op. 29, Impromptu in A♭ major

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In A Chopin changed the notation of the 1st and 3rd notes from c2 and g2 to b1 and f1. The unnecessary accidentals in the 2nd triplet in the bar are remains of the original notation.

category imprint: Corrections & alterations

issues: Enharmonic corrections

b. 17

composition: Op. 29, Impromptu in A♭ major

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On the 4th crotchet of the bar in FE there is no flat reinstating b1, which is an obvious error.

category imprint: Differences between sources

issues: Errors in FE

b. 18

composition: Op. 29, Impromptu in A♭ major

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We add a cautionary natural next to g1. The addition was already made in GE2 (→GE3→GE4).

category imprint: Differences between sources; Editorial revisions

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. 19

composition: Op. 29, Impromptu in A♭ major

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A and FE are lacking the cautionary flat before d on the 11th quaver. 

category imprint: Differences between sources; Editorial revisions

issues: GE revisions , Cautionary accidentals