Classical buffs - Identify this piece

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This file is by Chopin... played for piano and violin but I believe it was originally a nocturne written for solo piano, with the melody later being fit to violin accompanied by piano. I've looked around a bit but haven't found the original piece (I got it off file sharing years ago and it was poorly titled). Anyone want to show off their knowledge?

(Even if you can't identify it, this is a beautiful piece which you might want to listen to & enjoy.)




HERE IT IS