What is the most sung song in the world?

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Tags

1. #jolly
2. #include
3. #birthday
4. #simplest
5. #listed
6. #fellow
7. #records
8. #other
9. #commonly
10. #happy
11. #guinness
12. #continues
13. #world
14. #enduring
15. #songs
16. #tunes
17. #found