A
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The lack of 
indicating when to release the pedal written in A (→GE→FE→EE) in bar 20 need not be regarded an oversight. It is possible that Chopin envisaged a gradual releasing of pedal, difficult to mark precisely, or wanted to leave the way music fades out at the discretion of the performer.
Compare the passage in the sources »
category imprint: Editorial revisions
issues: No pedal release mark
notation: Pedalling
