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Source:
p. 9, b. 141-153
A - Autograph of the piano part
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The cautionary naturals before the f1-f2 octave are only in FE (→EE), added most probably by Chopin.
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, A, GE1a, Morch, GE2, FE1, FE2, FES, FED, FEJ, EE1, EE2, EE3