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b. 61

composition: Op. 21, Concerto in F minor, Mvt II

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In the main text we add cautionary naturals before c(1).

category imprint: Editorial revisions

b. 62

composition: Op. 21, Concerto in F minor, Mvt II

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The notation of accidentals is less careful in this bar. The oversight of the  lowering g to g in the group of 9 notes in the L.H. in A is a patent mistake; the sign was already added in GE1 (→GE2,FEEE). In some of the sources, the missing  before the 2nd note in the L.H. on the 4th beat of the bar results from a different convention of accidentals' validity – in A Chopin deleted this sign, considering the  before the crotchet on the 3rd beat to be valid. In turn, the absence of flats lowering g1(2) to g1(2) on the 4th beat in A (→GEFE) is a patent oversight – the fact that Chopin must have heard the g here is supported by the notes' uninterrupted presence from the end of bar 57 and by the use of cautionary naturals before G and at the beginning of bar 64. It is only EE that includes the fully correct notation, consistent with the contemporary conventions.

category imprint: Interpretations within context; Differences between sources; Corrections & alterations

issues: EE revisions , Corrections in A , GE revisions , Omission of current key accidentals , Last key signature sign

b. 63

composition: Op. 21, Concerto in F minor, Mvt II

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In the main text, we add cautionary naturals before the grace notes. Chopin also used them, but only at the beginning of bar 64.

category imprint: Editorial revisions

b. 64-72

composition: Op. 21, Concerto in F minor, Mvt II

Accompaniment in FES, interpretation

FES version with change suggested by the editors

Version of remaining sources

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It is puzzling that the changes of the bass note at the end of bar 64 and in the 1st half of bar 65, written in Morch and other sources of the orchestral part, were not considered in the harmonic accompaniment added in FES (see bars 45-52). According to us, it can be a result of inadvertence, hence we suggest a corresponding hypothesis in this place. 
The doubt about the rhythm's interpretation – see bar 69

After choosing the version with accompaniment, it may be necessary to select corresponding versions also in bar 65 (d-d) and 69 (g-g), 65 (staccato signs), 67 (tie of e2) and in notes on slurs in bars 6464-6565-68 and 66-69.

category imprint: Interpretations within context; Differences between sources; Editorial revisions

issues: Annotations in teaching copies , Annotations in FES , Authentic post-publication changes and variants

b. 64

composition: Op. 21, Concerto in F minor, Mvt II

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FE omits the cautionary  before g.

category imprint: Differences between sources

issues: EE revisions , Inaccuracies in FE , Cautionary accidentals