Why are restaurants not allowed to sing Happy Birthday?

Related questions

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2. Can Happy birthday be sung in public?
3. Is Happy birthday still under copyright?
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Tags

1. #protection
2. #customers
3. #actually
4. #roughly
5. #under
6. #copyright
7. #birthday
8. #happy
9. #chappell
10. #music
11. #employees
12. #domain
13. #available
14. #restaurant
15. #brings
16. #because
17. #warner
18. #public
19. #owners
20. #still
21. #until
22. #finally