Pitch
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b. 9-13
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composition: Op. 10 No 2, Etude in A minor
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The naturals returning a1, d2 and f2 in bars 9 and 13 are inaccurately written in some of the sources. In CLI they are totally absent, although in bar 13 the sign returning d2 is before the last semiquaver in the lower voice. In FEcor Chopin added them only in bar 9, yet, eventually, he also added the category imprint: Interpretations within context; Differences between sources issues: EE revisions , Errors in FE , Omissions to cancel alteration , GE revisions , Errors of CLI |
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b. 9
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composition: Op. 10 No 2, Etude in A minor
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FE (→GE,EE) has cautionary naturals before the last semiquaver in bars 9 and 13. Despite being undeniably authentic, the signs are, according to us, unnecessary in such a regular figuration. category imprint: Differences between sources; Editorial revisions issues: Cautionary accidentals |
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b. 9-13
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composition: Op. 10 No 2, Etude in A minor
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The cautionary naturals before c1 in the L.H. were added in bars 9 and 13 in one of the last proofreadings of FE (→GE). They are also included in EE, except for the category imprint: Differences between sources issues: Cautionary accidentals , EE inaccuracies , Authentic corrections of FE |
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b. 10-14
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composition: Op. 10 No 2, Etude in A minor
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Lack of the lower octave at the beginning of bar 10 in Ap may point to Chopin's hesitation, as the octave is both in CLI and FE (→GE,EE). The situation in bar 14, in which A1 was added by Chopin only in FEcor (→FE→GE,EE), suggests, however, that the bass note in the original Chopin's idea was supposed to be only A, while the lower octaves were added by Chopin only at the stage of reviewing the entire piece. Overseeing one or two places during this kind of serial corrections would often happen to Chopin (cf., e.g., the Etude in G category imprint: Differences between sources issues: Authentic corrections of FE , Bass register changes , Abbreviated octaves' notation |
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b. 10-14
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composition: Op. 10 No 2, Etude in A minor
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The third on the 3rd beat in bar 10 in CLI was probably meant to be a fifth in the original version (Terzverschreibung). In the sources Chopin's hesitation concerning the placement of the cautionary category imprint: Interpretations within context; Differences between sources; Editorial revisions; Corrections & alterations issues: EE revisions , GE revisions , Accompaniment changes , Authentic corrections of FE , Errors of CLI |
returning f2 in bar 13 in 
major, No. 5, 
