mUltimate Chopin

Op. 28 No. 17, Prelude in A♭ major

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b. 24-42

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

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category imprint: Differences between sources; Corrections & alterations

b. 25

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

d1 in chord in FCI

d1 in A (→FC→GE, →FE→EE)
..

The version of FCI featuring d1 (uncertain interpretation), hence perfect and not flatted fifth of the G7 chord, is naturally earlier and had already been abandoned by Chopin when A was being created (nothing points to an overlooked  – in the entire fragment, accidentals were inserted unusually meticulously; there are no oversights in this bar).

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes

b. 26

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

..

On the last quaver in A (→FC→GE1) there are no accidentals before the middle notes of the chords in both hands – a  before b1 and a  before d2. The patent inaccuracies were corrected in FE (only the ) and EE (both). In turn, in GE2 (→GE3) naturals were wrongly added before both notes.
(NB: both correct accidentals are present in FCI.) 

category imprint: Interpretations within context; Differences between sources

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

b. 26

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

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In GE the bottom note of the 2nd L.H. quaver is an erroneous f. The mistake does not concern the natural present before that note, which is placed at the pitch of g.

category imprint: Interpretations within context; Differences between sources

issues: Errors in GE

b. 26

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

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EE1 omitted a  raising a1 to a1 on the 2nd quaver and f2 to f2 on the 6th quaver. The deficiencies were corrected in EE2.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in EE