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In "Eastern" music (Arabic, Persian, Turkish) they also have quarter tones:
https://en.wikipedia.org/wiki/Quarter_tone
It sounds a bit like these notes are deliberately out of tune. A musician on Youtube explains this is done to create a certain mood called a "Maqam"
https://www.youtube.com/watch?v=ZLbQcs3W0Bs
I am certainly not an expert on this, but it is cool when a real expert is passionate about it.