When referring to genres of music what does R and B stand for?

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Tags

1. #artists
2. #performed
3. #related
4. #styles
5. #first
6. #palmer
7. #blues
8. #popular
9. #genre
10. #rhythm
11. #synonym
12. #musical
13. #music
14. #american
15. #wikipedia
16. #gospel
17. #combining
18. #selection
19. #african
20. #schools
21. #genres
22. #influences
23. #events
24. #subjects