Issues : Errors of A
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b. 18
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composition: Op. 10 No 12, Etude in C minor
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Lack of the category imprint: Interpretations within context; Differences between sources issues: Omissions to cancel alteration , Errors of A , Authentic corrections of FE |
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b. 27
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composition: Op. 10 No 12, Etude in C minor category imprint: Differences between sources |
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b. 52-65
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composition: Op. 10 No 12, Etude in C minor
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The 4th page of A (bars 50-65) is less carefully written; in fact only two octaves in the R.H. (also among these being a part of the chords), requiring cautionary accidentals, are correctly written (the octave in bar 50 and the chord at the beginning of bar 55). The remaining 13 either do not have any accidentals (bars 55 and 65, discussed separately) or they have an accidental only next to one of the notes. In the editions all these patent oversights were completed. category imprint: Interpretations within context; Differences between sources issues: Errors of A , Authentic corrections of FE |
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b. 55
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composition: Op. 10 No 12, Etude in C minor
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The version without flats, featured in A (→FE→EE), is perfectly correct from the musical point of view. In spite of this, it is almost certain that Chopin forgot to return a category imprint: Interpretations within context; Differences between sources issues: Omissions to cancel alteration , Errors of A |
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b. 55
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composition: Op. 10 No 12, Etude in C minor
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In A (→FE→EE3) there is neither the category imprint: Interpretations within context; Differences between sources issues: EE revisions , Accidentals in different octaves , GE revisions , Errors of A |
returning f is most probably Chopin's oversight here. The composer's concentration may have decreased when, after the chromatised bar 17, he reached the diatonic progression in the main key. In any case, the accidental added in a proofreading of 
2 to a2. This patent error was corrected in 
