Issues : Omissions to cancel alteration

b. 99

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