Pitch
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b. 99
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composition: Op. 29, Impromptu in A♭ major
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On the 8th quaver in A and FE there is no natural returning f1. In analogous bar 17 Chopin corrected his mistake, adding the natural in the pupils' copies FEJ and FES. The sign was added in GE and EE. category imprint: Interpretations within context; Differences between sources issues: Omissions to cancel alteration |
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b. 100
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composition: Op. 29, Impromptu in A♭ major
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We add a cautionary natural next to g1. The sign was added in A by someone else, it was also included in GE. category imprint: Differences between sources; Editorial revisions issues: Foreign hand additions in manuscripts , Cautionary accidentals |
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b. 101
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composition: Op. 29, Impromptu in A♭ major
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FE is lacking the d category imprint: Differences between sources issues: Errors in FE , Accidentals in different octaves |
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b. 103
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composition: Op. 29, Impromptu in A♭ major
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In A there are two naturals written by someone else next to the following notes: a category imprint: Source & stylistic information |
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b. 103
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composition: Op. 29, Impromptu in A♭ major
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In FE the natural raising b category imprint: Interpretations within context; Differences between sources issues: Errors in FE |
1 flat. The error certainly stems from the oversight of the previous d quaver with a natural, placed one octave lower. 
