You are out of your mind. One thing is direct quotation or adaptation of folk music, something that milions of composers did with very specific reasons in mind, from Brahms to Ives. Other thing is plagiarism. When Bartok used a folk melody he didnt say it was his melody. He said it was his arrangement of a pre-existing melody. Horner never said something like that. He simply stole one piece of music that already existed and tried to pass it as his own, one thing that he is constantly doing. Please cut the crap.