Two midi files were added.
Nocturne No.7 in C-sharp minor Op.27-1 was added to Chopin - 2 Nocturnes Op.27 on December 30, 2007.
Nocturne No.9 in B major Op.32-1 was added to Chopin - 2 Nocturnes Op.32 on January 27,2008.
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The information article will be added when the midi file is added to the one written (excerpt) in the title of the article in the future.