It’s all scales friends. Different parts of the world have tendencies to use certain scales. Look up those scales, use the notes found in them to create a melody that sounds nice in any given key, and your composition should sound similar to what your hearing.
I’m not sure what similarity you recognize between Celtic and Arabic music, I personally don’t see one. However, we do have to remember that music is entangled very closely with our emotions. The similarity that you’re hearing may have to do with a particular mood, memory, or your personal relationship with certain intervals.
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