Pitch
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b. 1
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composition: Op. 28 No. 21, Prelude in B♭ major category imprint: Corrections & alterations; Source & stylistic information issues: Corrections in A , Deletions in A , Changed phrase length |
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b. 3
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composition: Op. 28 No. 21, Prelude in B♭ major
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In A one can see a crossing-out between the category imprint: Corrections & alterations; Source & stylistic information issues: Corrections in A , Deletions in A |
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b. 5
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composition: Op. 28 No. 21, Prelude in B♭ major
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In the main text we add a cautionary category imprint: Differences between sources; Editorial revisions issues: EE revisions |
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b. 6
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composition: Op. 28 No. 21, Prelude in B♭ major
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In FE the category imprint: Differences between sources issues: EE revisions , Errors in FE , Fontana's revisions |
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b. 6
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composition: Op. 28 No. 21, Prelude in B♭ major
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The sources do not contain an accidental before the top note of the third on the 4th quaver in the bar, as a result of which it should be interpreted as e-g category imprint: Interpretations within context; Editorial revisions issues: Omissions to cancel alteration , Errors of A , Errors repeated in GE , Errors repeated in FE , Errors repeated in EE |
and the 3rd quaver. It was most probably the 
before a that was removed (superfluous), yet it seems that, for some reason, Chopin also crossed out the correctly written f
-a third, which he then reintroduced next to it. If it was so, the reason could have been, e.g. accidentally blurred noteheads, even partially, as a side effect of removing the natural.
before the 2nd quaver is misplaced: it should be before the bottom note (g
), not the top one (e