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b. 12

composition: Op. 24 No. 3, Mazurka in A♭ major

A double bar line in AI

No line in A (→GEFEEE)

..

In AI, there is a double bar line before the 3rd beat of the bar. No such line, separating a new section of the Mazurka beginning here, is to be found in A (→GEFEEE).

category imprint: Differences between sources

issues: Chopin's hesitations

b. 13-17

composition: Op. 24 No. 3, Mazurka in A♭ major

..

In bars 13-17 in AI the chords are written in the treble clef on the lower staff. In our edited text of AI the graphical arrangement of chords follows the other sources.

category imprint: Differences between sources

b. 13

composition: Op. 24 No. 3, Mazurka in A♭ major

Without repeat of bars 13-36 in AI

Repeat sign in A (→GEFEEE)

..

In AI the section corresponding to bars 13-36 of the ultimate version is not repeated.

category imprint: Differences between sources; Corrections & alterations

issues: Differences in form

b. 20-21

composition: Op. 24 No. 3, Mazurka in A♭ major

..

Erasures and other traces visible in A demonstrate that initially Chopin noted the minim e1 sustained in bars 20-23 on the upper staff.  The laborious graphic alteration must have been undertaken to convey some vital information: that note, struck with the right hand at the beginning of bar 20, is then much more convenient to play when taken over and sustained with the left hand.  

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A

b. 25-35

composition: Op. 24 No. 3, Mazurka in A♭ major

..

In AI these bars are not written out—Chopin marked them as a repetition of bars 1-11 with an indication dal segno al *. Cf. the characteristics of AI.

category imprint: Differences between sources; Source & stylistic information