What is the best selling single?

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Tags

1. #holiday
2. #worldwide
3. #according
4. #christmas
5. #named
6. #selling
7. #copies
8. #million
9. #single
10. #before
11. #crosby
12. #music
13. #world
14. #known
15. #white
16. #charts
17. #guinness
18. #released
19. #created
20. #records