How many Led Zeppelin songs are about Lord of the Rings?

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Tags

1. #fantasy
2. #mountain
3. #where
4. #black
5. #songs
6. #hobbit
7. #wraiths
8. #evermore
9. #zeppelin
10. #battle
11. #spend
12. #baggins
13. #reference
14. #bilbo
15. #place
16. #misty
17. #their
18. #dwarf
19. #named
20. #series
21. #favorite