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Source:
p. 2, b. 17-34
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b. 19
GE has no cautionary to e1. The accidental in FE was probably added by Chopin at the stage of proofreading of FE1. It is indicated by the lack of planned space for a in this bar and by the presence of naturals in analogous b. 45 and 71, but not 278 and 304.
Compare the passage in the sources»
category imprint: Differences between sources
issues: Cautionary accidentals, Authentic corrections of FE
notation: Pitch
Missing markers on sources:
GE1, GE2, FE1, FE2, EE1, EE2, EE3, FES