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b. 5

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

g2 in FCI & A (→FC,FEEE)

f2 in GE1

g2 with  in GE2 (→GE3)

..

The version of GE1 featuring f2 on the 3rd quaver is most probably a mistake of the engraver. In GE2 f2 was rightly changed to g2; at the same time, a cautionary  was added before the latter. We include this addition, which we find justified, in the main text.

category imprint: Differences between sources; Editorial revisions

issues: Errors in GE , GE revisions

b. 5

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

Triads in FCI & A (→FC,FEEE)

Thirds in GE

..

The missing a notes in the chords in the 2nd half of the bar are a mistake of the engraver of GE.

category imprint: Differences between sources

issues: Errors in GE

b. 13

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

..

As was the case with b. 5, in the main text we add a cautionary  before g2. The accidental was also added in GE2 (→GE3).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 19

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

f1 in FCI

f1 in A (→FCGE, →FEEE)

..

In the version prepared for print, the top note of the chord on the 5th quaver in the bar, interpreted literally, is an f1, since it is not accompanied by a relevant accidental in this bar. The following arguments prove that it was almost certainly Chopin's mistake:

  •  put before that note in FCI, confirming the authenticity of the version with f1,
  • presence of e1 (played with the L.H.) in that chord,  which, together with f1, would result in an unpleasant cluster – cf. b. 21, in which Chopin avoided a similar cluster by omitting g1.

category imprint: Interpretations within context; Differences between sources; Source & stylistic information

issues: Omission of current key accidentals , Errors of A , Deletions in A

b. 19

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

g-d1-e1 in FCI & A (→FEEE)

g-e1 in FC (→GE)

..

The version of FC (→GE) resulted from the copyist having overlooked d1 in the last chord in the bar.

category imprint: Differences between sources

issues: Errors of FC