Famous singers songs (hard)

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Across
  1. 1. luciddreams
  2. 3. onedance
  3. 6. wakemeup
  4. 8. smeonelikeyou
  5. 9. newrules
  6. 11. starships
  7. 12. mine
  8. 13. countingstars
  9. 15. 18
  10. 17. sidetoside
  11. 18. happier
Down
  1. 1. baby
  2. 2. lastchristmas
  3. 4. blankspace
  4. 5. diamond
  5. 7. halo
  6. 10. classic
  7. 12. uptownfunk
  8. 14. ihavenothing
  9. 16. notafraid