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b. 72-74

composition: Op. 10 No 4, Etude in C♯ minor

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We add cautionary sharps before d2 in bars 72 and 74. The signs were already added in GE, while the second of them also in EE4. In bar 74 FE (→GE1,EE) has an additional unjustified  before the 12th semiquaver (c3). This probably erroneous sign was removed in subsequent GE,s. 

category imprint: Differences between sources

issues: EE revisions , GE revisions , Cautionary accidentals

b. 74

composition: Op. 10 No 4, Etude in C♯ minor

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In GE3 the  returning e2 on the 5th semiquaver of the bar was overlooked.

category imprint: Differences between sources

issues: Errors in GE

b. 75

composition: Op. 10 No 4, Etude in C♯ minor

g2 in AI

g2 in FE (→EE)

g2 in GE

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Lack of the  returning g2 in GE may reveal the fact that the sign was not added until the last proofreading of FE (→EE). The sharp became necessary here due to enharmonic changes in the notation of the previous group.

category imprint: Differences between sources

issues: Errors resulting from corrections , Authentic corrections of FE

b. 75

composition: Op. 10 No 4, Etude in C♯ minor

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In AI the first 3 semiquavers in the 2nd half of the bar are written as f2-g2-f2 in the R.H. and f1-f1-f1 in the L.H. Chopin changed the notation in a proofreading of FE (→GE,EE). However, he left the sharps before f1 and f2 at the beginning of the last semiquaver group, superfluous after the change.

category imprint: Differences between sources; Editorial revisions; Corrections & alterations

issues: Enharmonic corrections , Authentic corrections of FE

b. 81

composition: Op. 10 No 4, Etude in C♯ minor

Octave in AI

Single note in FE (→GE,EE)

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The octave in AI is most probably the original version, changed by Chopin probably in [A]. The change may be explained with the willingness to preserve the bottom C1 in order to enhance the effect of the final octaves of the Etude.

category imprint: Differences between sources; Corrections & alterations