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b. 12-13

composition: Op. 28 No. 16, Prelude in B♭ minor

..

In A (→FC,FE) there is no accidental before the 4th semiquaver in the 3rd group, which would result in f2, which is impossible in this context. The oversight of a cancelled alteration, frequently encountered in Chopin's music, was corrected in GE and EE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Omissions to cancel alteration , GE revisions , Errors of A , Errors repeated in FE

b. 12-13

composition: Op. 28 No. 16, Prelude in B♭ minor

..

In the main text we add cautionary flats before e. The accidentals were also added in GE2.

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 15

composition: Op. 28 No. 16, Prelude in B♭ minor

..

In the main text we add cautionary flats before a and a1.

category imprint: Editorial revisions

b. 16

composition: Op. 28 No. 16, Prelude in B♭ minor

a-c1-g1 in A (→FC,FEEE)

a-g1 in GE

..

The notation of the chord on the 2nd quaver in the bar is ambiguous in FC – the c1 note, although most probably written by Fontana, is actually imperceptible and was not included in GE.

category imprint: Graphic ambiguousness; Differences between sources

issues: Inaccuracies in FC

b. 16-17

composition: Op. 28 No. 16, Prelude in B♭ minor

..

The crossings-out visible in the L.H. part in A allow us to decipher the initial version of the ending of b. 16 and of entire b. 17, which is as follows: .

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A , Accompaniment changes