GC
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In the copyist's notation of this chord in GC there is no ledger line for a2 (compare identical errors in bars 91 and 100). The line penciled in here was most probably added by the egraver or editor.
Compare the passage in the sources »
category imprint: Source & stylistic information
issues: Terzverschreibung error, GE revisions, Errors of GC
notation: Pitch