Is this music piece that remains a mystery on MuseScore?

• Mar 30, 2023 - 18:53

It may take somebody who is extremely familiar with classical music or maybe Polish music to identify this music piece. It has been asked for many years on many videos but yet it remains as a mystery:

https://youtu.be/mXEEeGP1ds4?t=39

Somebody even found an image of the music sheet but it was quite blurry: https://forum.pianoworld.com/ubbthreads.php/topics/3267697/all/help-ide…

Is this on MuseScore, does anybody know? I just hope when I got some free time in the future I can get to learn it.

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