What are the musical roots of rhythm and blues?

Related questions

1. Why is it called 12 Bar Blues?
2. What are some examples of R&B music?
3. What is the home of the blues?
4. Is Blues Music happy or sad?
5. Why do people listen to the blues?
6. Who invented rhythm and blues?
7. What are the common musical features of the Twelve Bar Blues?
8. How do you define blues music?
9. When was rhythm and blues created?
10. What music style is R&B based on?

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7. #roots
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9. #songs
10. #rhythm
11. #genres
12. #mosaic
13. #presented
14. #blues
15. #influences
16. #urban
17. #cultural
18. #music
19. #styles
20. #poetics
21. #reflect
22. #popular