Issues : Accidental below/above the note

b. 45

composition: Op. 27 No 2, Nocturne in D♭ major

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A flat before g flat3 is written in A not before the head of the note but much lower. That type of peculiar notation is often encountered in Chopin's manuscripts. 

category imprint: Source & stylistic information

issues: Accidental below/above the note