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The music in question is not exactly owned by the other individual either, as it's simply an arrangement of a game's soundtrack as a midi or music sheet.
Am I allowed to use these in my videogame? Should those persons be given credit or should it go to the original composers of the track in the original video game?
Should I ask for permission for the authors of the rearrange? What if the file and site list no author? What if it lists an author but I have no means to reach and ask?