music, mood and health

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Across
  1. 3. make better
  2. 7. to sing a piece of music while someone else is singing
  3. 8. make happen
  4. 9. degree of loudness
  5. 10. become happier
  6. 11. prevent concentration
  7. 12. have an effect on
  8. 14. an exchange of opposite views
Down
  1. 1. make more
  2. 2. become more relaxed
  3. 4. a session of physical exercise or training
  4. 5. focus
  5. 6. make less
  6. 7. go faster
  7. 13. opposite of switch off