Rhythm
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b. 57
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composition: Op. 29, Impromptu in A♭ major
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The illogical and erroneous notation of the last third in A ‒ 2 voices, in the upper one a crotchet, in the lower one a quaver ‒ is probably a result of a carelessly introduced correction. category imprint: Interpretations within context; Corrections & alterations issues: Rhythmic errors |
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b. 74
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composition: Op. 29, Impromptu in A♭ major
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The sources differ in the rhythmic values of particular chord components, which probably stems from the notation of the manuscripts, which were either unclear or unintelligible for the engravers. A may be interpreted in 2 ways: it is not certain whether 3 lower notes of the chord are supposed to be minims or semi breves. The second notation is rhythmically exact, yet the notation of the last quaver with the stem directed downwards suggests that Chopin understood the ending of the bar monophonically. Considering the fact that Chopin would sometimes write chord components without stems (in the case of crotchets it does not lead to misunderstandings), we see that the notation in A may be understood in such way as it was done in GE. Together with the application of authentic pedalling its sound equals the notation with semi breves; practically, it is even closer to the real performance (the c1 note cannot be held longer than for a minim, as it is struck in the L.H.). category imprint: Interpretations within context; Differences between sources issues: EE revisions , Errors in FE , Different values of chord components |
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b. 77
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composition: Op. 29, Impromptu in A♭ major
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FE is lacking the crotchet stems on the 4th and 11th quavers in the R.H., while in GE the stem of the 11th quaver was omitted. The notation of A and EE is almost entirely compatible. category imprint: Differences between sources issues: Errors in FE , Errors in GE |
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b. 80
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composition: Op. 29, Impromptu in A♭ major
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In EE the grace note at the beginning of the bar is non-slashed. category imprint: Differences between sources issues: Notation of grace notes |
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b. 83-88
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composition: Op. 29, Impromptu in A♭ major
category imprint: Differences between sources issues: GE revisions |
1 would complete the rhythm of the lower voice. It can be assumed that Chopin was ending the notation of the upper c2, as his attention was drawn by the issue of the L.H. which overlapped the g1 note, which is held during almost the entire bar. He decided to shorten it and as a consequence he forgot to finish the last quaver. 
