Issues : Errors repeated in FE

b. 19

composition: Op. 28 No. 8, Prelude in F♯ minor

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None of the sources includes a  restoring b1 in the 3rd to last demisemiquaver. A comparison with two previous appearances of that bar – b. 1 and 5 (b. 2 is marked in an abridged manner as a repetition of b. 1) – proves that it was Chopin's mistake in A, not noticed in any of the remaining sources.

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

b. 19-23

composition: Op. 28 No. 21, Prelude in B♭ major

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In A Chopin overlooked a few necessary flats in the R.H. part: in b. 19 d2, in b. 21 d3 and g2, in b. 22 d2 and d3. FC added only the first  in b. 21; in addition, the copyist overlooked the  of g2 in b. 23. FE also added only some of the necessary flats, next to d2(3) in b. 21-22, and – which is puzzling – also overlooked the  of g2 in b. 23. GE and EE added all necessary accidentals.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , Accidentals in different octaves , GE revisions , Omission of current key accidentals , FE revisions , Inaccuracies in FC , Fontana's revisions , Inaccuracies in A , Errors repeated in FE

b. 19

composition: Op. 28 No. 22, Prelude in G minor

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A (→FE,FCGE) has no  lowering a1 to a1. The obvious inaccuracy was spotted only in EE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Omission of current key accidentals , Errors of A , Errors repeated in GE , Errors repeated in FE

b. 19

composition: Op. 28 No. 17, Prelude in A♭ major

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In A (→FC,FE) as well as in FCI there is no  raising e to e. The obvious Chopin's inaccuracy was corrected in GE and EE.
FC also lacks  in front of the first L.H. quaver, E. Fontana's error was corrected in GE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions , Errors of FC , Inaccuracies in A , Errors repeated in FE

b. 21

composition: Op. 28 No. 8, Prelude in F♯ minor

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In the sources, there are no accidentals before the first and last notes of the 3rd L.H. figure. Therefore, the bottom one should be interpreted as a due to the  in the previous figure (it is particularly clear in the notation of the sources, in which the 3rd figure is still written in the bass clef). Naturally, it is Chopin's oversight – the harmonic context requires the notes to be interpreted as a1 and a; in such a situation, the top one does not need a , and Chopin considered an accidental next to the bottom one superfluous in such cases (cf. b. 3-4). In the main text we add a cautionary  also next to a1

category imprint: Interpretations within context; Editorial revisions

issues: Omissions to cancel alteration , Inaccuracies in A , Errors repeated in GE , Errors repeated in FE , Errors repeated in EE