Rhythm
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b. 39
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composition: Op. 12, Variations in B♭ major
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The missing augmentation dot to the second d crotchet in FE (→EE) is most probably a mistake, corrected in GE – in the original opera score this d is simply a dotted minim. Therefore, in the main text we propose this notation with a minim as it is simpler and clearer. category imprint: Interpretations within context; Differences between sources; Editorial revisions issues: Errors in FE , GE revisions |
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b. 49
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composition: Op. 12, Variations in B♭ major
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The f1 note at the beginning of the bar is a dotted crotchet in FE. This augmentation dot is practically meaningless, since f1 is repeated on the 3rd quaver. Therefore, it is probably a mistake or a trace of the initial version, without repeating f1 on the 3rd quaver. In this situation, in the main text we include the change introduced by GE and EE, in which the dot was omitted. category imprint: Differences between sources; Editorial revisions issues: EE revisions , Inaccuracies in FE , GE revisions |
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b. 54-55
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composition: Op. 12, Variations in B♭ major
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In FE in bar 54 and 55 the augmentation dots to the L.H. f minims are missing. It must be an oversight, in GE corrected only in bar 55, while in EE in both bars. Moreover, in GE the augmentation dot to the e1 crotchet in bar 54 was overlooked. We comprehensively discuss all irregularities concerning the rhythmic notation and the issue of division into parts in this fragment of the Variations in the note in bar 39. category imprint: Differences between sources issues: EE revisions , Errors in FE , GE revisions , Errors repeated in GE |
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b. 56
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composition: Op. 12, Variations in B♭ major
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The f dotted minim present in the sources is almost certainly erroneous. It could be a remaining element of the initial, original bass version – in the opera score this f lasts 5 quavers and goes directly to d. Chopin changed the bass line by adding a b category imprint: Editorial revisions issues: Errors in FE , Rhythmic errors |
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b. 58
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composition: Op. 12, Variations in B♭ major
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In FE the f note at the beginning of the bar is a dotted minim, which must be considered a mistake in this context. In the main text we include the correction introduced by GE and EE, in which the minim was replaced by a crotchet. We list all irregularities concerning the rhythmic notation and the issue of division into parts in the theme and in the first variation in the note in bar 39. category imprint: Differences between sources; Editorial revisions issues: EE revisions , Errors in FE , GE revisions , Errors repeated in EE |
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in 
suggested by the editors
crotchet in the middle of the bar, but apparently he did not make sure the preceding f note was shortened accordingly. In the main text we replace the minim by a crotchet, resulting in a logical bass sequence.