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b. 237
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composition: Op. 42, Waltz in A♭ major
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There are no accidentals before the 2nd chord of the bar in FE0 (→FEG). This patent inaccuracy was corrected in FE1 (partially, as only a category imprint: Interpretations within context; Differences between sources issues: Errors in FE , Accidentals in different octaves , GE revisions , Omission of current key accidentals , Authentic corrections of FE , Authentic corrections of GE , Authentic corrections of EE |
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b. 237-239
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composition: Op. 21, Concerto in F minor, Mvt I
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The fingering in the R.H. in bars 237 and 239 coming from Chopin was written – probably with the pupil's hand – into FED. category imprint: Differences between sources |
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b. 237
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composition: Op. 21, Concerto in F minor, Mvt I
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The fingering of the first two semiquavers in the L.H. was added by Chopin, while he was proofreading FE (→EE). Cf. bars 233-235. The next four digits were written already in A and they are present in all sources. category imprint: Differences between sources issues: Authentic corrections of FE |
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b. 237
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composition: Op. 21, Concerto in F minor, Mvt I
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In the main text we add cautionary flats before the D category imprint: Editorial revisions |
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b. 237
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composition: Op. 21, Concerto in F minor, Mvt I
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The cautionary natural before G, the 1st semiquaver in the L.H., was added in the proofreading of GE1 (→FE→EE, →GE2). According to us, this random addition could have been performed at Chopin's request. category imprint: Differences between sources issues: Authentic corrections of GE |
before b2 was added) and in 
-d