mUltimate Chopin

Op. 28 No. 17, Prelude in A♭ major

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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

..

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

..

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

b. 26

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

..

There is no  raising e1 to e1 in A (→FC,FE). The obvious inaccuracy was corrected in GE and EE.

category imprint: Interpretations within context; Differences between sources

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

b. 28-30

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

..

In A Chopin inserted cautionary naturals before c1 in b. 28 and 30, repeated in all subsequent sources (they are absent in FCI). In the main text we keep only the former of those dispensable accidentals, adding a  before c2 in the R.H. part for symmetry.

category imprint: Differences between sources; Editorial revisions

issues: Cautionary accidentals