figure of speech of the song

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Across
  1. 2. "Hello darkness, my old friend"
  2. 4. "I've died every day waiting for you"
  3. 6. - pharre Williams
  4. 7. symphony - the verse
  5. 8. like a bird - Nelly Furtado
  6. 10. blood - Taylor Swift
  7. 11. "cause baby, now we got bad blood"
  8. 13. cars - snow patrol
  9. 17. sound of silence - Simon & Garfunkel
  10. 18. "cause it's a bittersweet symphony, this life"
  11. 19. "I'm like a bird, I'll only fly away"
Down
  1. 1. of hearts - Christina Perri
  2. 3. "boom clap, the sound of my heart"
  3. 5. - Katy Perry
  4. 9. "Cause baby you're a firework"
  5. 12. "if I lay here, if I just lay here"
  6. 14. "we could have had it all, rolling in the deep"
  7. 15. clap - charli XCX
  8. 16. in the deep - adele
  9. 20. "clap along if you feel like a room without a roof"