Pop Quiz time

This isn't a list, it's more of a quiz. Listen to the intro, and name the song and artist. Email the answers to ian (dot) hall (at) oup (dot) com, rather than posting them in the comments, as that will spoil everyone's fun. I'm hoping you will find some quite challenging.

1. Number 1
   
2. Number 2
   
3. Number 3
   
4. Number 4
   
5. Number 5
   
6. Number 6
   
7. Number 7
   
8. Number 8
   
9. Number 9
   
10. Number 10
    
11. Number 11
    
12. Number 12
    
13. Number 13
    
14. Number 14
    
15. Number 15
    
16. Number 16
    
17. Number 17
    
18. Number 18
    
19. Number 19
    
20. Number 20
    

If it helps, they were all singles released in the same year.