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Rhythm

b. 15

composition: Op. 21, Concerto in F minor, Mvt II

Crotchet e in A & GE2

Quaver e in GE1 (→FEEE)

..

The notation of A may raise certain doubts here: the line combining both a seems to be a tie, which, however, would require the first a to be a crotchet. Chopin may have resigned from a precise notation, since he wanted to avoid deletions or excessive complications: . The notation of A was repeated without changes in all editions (this kind of simplified notation can be found in other pieces by Chopin, in the Polonaise in C minor, Op. 40 No. 2, bars 82 and 109 or in Allegro de Concert, Op. 46, bars 162 and 163).

Omission of the stem extending e on the 4th quaver is most probably an inaccuracy of the engraver of GE1 (→FEEE). In GE2 the stem was restored, yet the inaccuracies of notation described above (in spite of introducing a few other arbitrary changes) were not removed.    

category imprint: Differences between sources

issues: Inaccuracies in GE

b. 15

composition: Op. 21, Concerto in F minor, Mvt II

Quaver e1 in A (→GE1FEEE)

Tied crotchet e1 in GE2

..

Tying e1 in GE2 is probably an attempt to interpret an unclear legato slur in A.

category imprint: Differences between sources

issues: GE revisions

b. 26

composition: Op. 21, Concerto in F minor, Mvt II

Synchronization mark in FED

No mark in A (→GEFEEE)

category imprint: Differences between sources

issues: Annotations in teaching copies , Annotations in FED

b. 28

composition: Op. 21, Concerto in F minor, Mvt II

..

In EE the group of 27 demisemiquavers was written with small notes, most probably in order to save space.

category imprint: Differences between sources

issues: EE revisions

b. 32

composition: Op. 21, Concerto in F minor, Mvt II

Demisemiquaver g3 in A (→GE)

Demisemiquaver f3 in FE (→EE)

..

Same as in bar 13, the change of rhythm is probably a result of a mistake or revision, this time of the engraver of FE (→EE). Same as in that case, a possibility of Chopin's proofreading cannot be, however, entirely excluded.

category imprint: Differences between sources

issues: FE revisions , Inserted rest