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The dynamic indications in bars 43 and 45 clearly show the evolution of Chopin's concept in this respect:
-
AW, devoid of crescendos in bars 36-40, has a
only in bar 43 (and a 
4 bars later – see bar 47). Lack of a clear increase in dynamics was somehow compensated with agogic changes in bars 38-40 and 48-50; -
in [A] Chopin added poco a poco cresc. in bars 36-37 and 39-40, deleted in bar 43 and moved from bar 47 to 45. In addition, he added smorz. at the transition between bars 47-48 and omitted all purely agogic indications – this state is rendered by CDP and indications written with the copyist's hand in GC;
-
preparing the piece for publication, Chopin enhanced the second wave of crescendo (bars 39-40), added a
in bar 43 and changed to in bar 45.
Therefore, the changes included rejection of suggestion of agogic vivification and assuagement in favour of two increasing dynamic waves, which was eventually detailed due to the indication of the climax in bar 43 and later withdrawal until sempre piano in bar 51.
category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections in GC
notation: Verbal indications
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