At the risk of starting a riot......!
We always get 'arguments' about whether this or that is this genre or that genre etc, but it's usually because we are discussing songs/bands that are on the periphery of a style, or who borrow from different styles. However, to see if we more or less agree on 'the basics', go through the list below and say which band/artist springs immediately to mind as typical of that era/genre.
1. 60's Pop
2. 70's Pop
3. 80's Pop
4. 90's Pop
5. Current / Recent Chart
6. Big Band
7. "Cheese"
8. Country, Folk, etc
9. Disco
10. Funk
11. Garage
12. Glam Rock
13. House
14. Indie
15. Old Skool
16. R&B
17. Reggae
18. Rock (Soft/Commercial)
19. Rock (Heavy)
20. Rock 'n' Roll or Rockabilly
21. Ska
22. Soul, Motown, etc