Why is it called a riff?

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Tags

1. #series
2. #musical
3. #notes
4. #repeated
5. #terms
6. #called
7. #about
8. #phrase
9. #introduction
10. #itself
11. #songs
12. #music
13. #often
14. #summarizes
15. #pattern
16. #lyrical
17. #guitar
18. #chord