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b. 1-2

composition: WN 17, Polonaise in B♭ major

..

The version of JC and EF is certainly earlier and perhaps totally erroneous due to misunderstanding of the short cut and probably unclear notation of [AI].

category imprint: Differences between sources; Corrections & alterations

b. 3-4

composition: WN 17, Polonaise in B♭ major

Few octaves in JC

No octaves in EF

Octaves in PE

..

From the musical point of view, the version of JC seems to be very dubious: the indication [con] 8 - - - is probably written in a wrong place – it was supposed to include the entire bass progression in bar 4. However, most probably we are dealing here with a misunderstanding of the corrections of the entire introduction (bars 1-8) written in a short cut manner in [AI]. The same applies to the version of EF

In EF there are no rests at the end of bar 4, as the phrase ends with a crotchet (in the parts of both hands).

category imprint: Differences between sources

issues: Errors of JC

b. 3

composition: WN 17, Polonaise in B♭ major

in JC

G1-G in EF

B1-B in PE

..

Using a chord without third at the beginning of the bar, as it is both in JC and in EF, raises doubts as to the correctness of Chopin's notation reading in [AI]. However, even if that version was intended by Chopin in any stage, later it was replaced by the musically smoother version of PE

category imprint: Differences between sources

b. 3

composition: WN 17, Polonaise in B♭ major

R.H. in JC

..

The version of JC and EF, with a clearly audible doubled leading note B-b on the 5th quaver of the bar, is undoubtedly earlier. It is difficult to determine how the difference concerning sustaining the note at the transition between bars 3 and 4 was developed. In PE, the lower note of the last semiquaver was printed on the level of c1, which is certainly a mistake corrected by us into d1.

category imprint: Differences between sources

issues: Main-line changes

b. 4

composition: WN 17, Polonaise in B♭ major

..

In JC, there is a cautionary  before the third quaver (A), which is completely unjustified in the context of the version of bar 3 written in that copy.

category imprint: Source & stylistic information

issues: Cautionary accidentals