Issues : Last key signature sign
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b. 45-57
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composition: Op. 50 No. 3, Mazurka in C♯ minor
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On the basis of AI one can see that Chopin hesitated whether to write the B major section (from b. 45) using a 4- or a 5-sharp key signature. It is proven by the following actions: a new key signature was added in b. 45 and 57, then the sharps of A category imprint: Corrections & alterations; Source & stylistic information issues: Chopin's hesitations , Last key signature sign , Corrections of AI |
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b. 49
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composition: WN 17, Polonaise in B♭ major
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JC has a cautionary category imprint: Source & stylistic information |
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b. 49
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composition: Op. 11, Concerto in E minor, Mvt II
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In FE (→GE1→GE2), there is no accidental before the 4th demisemiquaver before last. The missing category imprint: Interpretations within context; Differences between sources issues: EE revisions , Errors in FE , Accidentals in different octaves , GE revisions , Cautionary accidentals , Omission of current key accidentals , Last key signature sign , Errors repeated in GE |
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b. 51
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composition: WN 17, Polonaise in B♭ major
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JC has a cautionary category imprint: Source & stylistic information |
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b. 51
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composition: Op. 21, Concerto in F minor, Mvt I
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In A (→GE1→FE) there is a totally unjustified category imprint: Differences between sources; Editorial revisions issues: EE revisions , GE revisions , Cautionary accidentals , Last key signature sign |
and a
before the 4th semiquaver, a1. In the light of the currently binding rules, a sign in this position is superfluous.
must be a mistake in this context, probably repeated after [A], since such inaccuracies in the notation of accidentals are typical of Chopin. The sharp was added in 
before the top note of the octave (d
). In