Why is it called alternative music?

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Tags

1. #became
2. #underground
3. #1970s
4. #genre
5. #distinction
6. #simply
7. #alternative
8. #1980s
9. #style
10. #called
11. #music
12. #independent
13. #emerged
14. #refers
15. #popular
16. #mainstream
17. #widely
18. #instance