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Source:
p. 16, b. 494-523
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The crossings-out visible in A allow us to reconstruct the previous version of the 2nd and 4th chords: 
. The textural affinity with the motifs in b. 516-518 allows us to assume that it was the original version.
Compare the passage in the sources»
category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Deletions in A, Accompaniment changes
notation: Pitch
Missing markers on sources:
FE1, FED, FES, FESf, GE1, GE2, GE3, EE1, EE2, EE3, A, FC