Pitch
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b. 305
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composition: Op. 21, Concerto in F minor, Mvt I
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The alleged additional crotchet stem next to c1 visible in A is, according to us, an exceptionally imposing trace of Chopin's reflex at the time of writing notes on ledger lines. In order to secure visibility of such a note, the composer would give the note head the shape of a vertical line – see analogous note in bar 303. Sometimes, particularly when writing in haste (as in this case), the lines were long enough to look like a crotchet stem pointing downwards (a slightly shorter line in bar 301 did not mislead the engraver). See also the Etude in F major, Op. 10 No. 8, bars 4-7. category imprint: Graphic ambiguousness; Differences between sources |
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b. 306
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composition: Op. 21, Concerto in F minor, Mvt I
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The cautionary flat before e category imprint: Differences between sources issues: Cautionary accidentals , Authentic corrections of GE |
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b. 307
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composition: Op. 21, Concerto in F minor, Mvt I
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In the main text we add a cautionary category imprint: Editorial revisions |
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b. 307
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composition: Op. 21, Concerto in F minor, Mvt I
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In A (→GE→FE) there are no naturals before the d1 notes (in both hands) and d3. In EE two of them were added (apart from d1 in the R.H.). category imprint: Interpretations within context; Differences between sources issues: EE revisions , Accidentals in different octaves , Omission of current key accidentals , Inaccuracies in A |
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b. 308
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composition: Op. 21, Concerto in F minor, Mvt I
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In A there are no naturals before a2, a1 (in both hands) and the d2 semiquaver. In GE (→FE) a category imprint: Interpretations within context; Differences between sources issues: EE revisions , Accidentals in different octaves , GE revisions , Omission of current key accidentals , Inaccuracies in A |
3 was added – perhaps by Chopin – in the proofreading of 
before b
was added only in the L.H.;