Who sings the song?

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Across
  1. 4. Coincidence
  2. 6. Fireball
  3. 7. Happier
  4. 8. 99 Luftballons
  5. 10. Bellas lullaby
  6. 11. C’mon C’mon
Down
  1. 1. The Ketchup Song
  2. 2. You broke me first
  3. 3. Here comes the sun
  4. 5. State of Grace
  5. 9. Dolls Iris
  6. 12. Married with Children