What is Metallica's best selling song?

Related questions

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2. Is Hardwired Metallica's last album?
3. How many black albums has Metallica sold?
4. Is Lars still with Metallica?
5. How many copies did the black album sell?
6. Why did Dave Mustaine leave Metallica?
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Tags

1. #unforgiven
2. #known
3. #enter
4. #singles
5. #among
6. #include
7. #matters
8. #wherever
9. #songs
10. #which
11. #produced
12. #considered
13. #nothing
14. #metallica
15. #sandman