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Source:
p. 20, b. 476-495
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As in bar 483, FE contains two cautionary accidentals in this bar – a 
before f
2 (the 3rd semiquaver) and a 
before a on the 4th quaver – added most probably in the last phase of proofreading, since they are absent in GE. GE, in turn, added sharps before g2 and g. The latter was added also in EE, yet the on the 4th quaver was overlooked. In the main text, we include all the aforementioned accidentals.
Compare the passage in the sources»
category imprint: Differences between sources; Editorial revisions
issues: EE revisions, GE revisions, Cautionary accidentals, Authentic corrections of FE
notation: Pitch
Missing markers on sources:
FE1, FED, FEH, FEJ, FES, GE1, GE2, GE3, EE1, EE2, EE3, GE2a, FEFo