Why do we have to do this...?

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Across
  1. 2. The low "E" is on the bottom _______
  2. 6. This type of note gets 4 beats
  3. 7. Mr. Walker's dog is this color
  4. 8. A rest tell us to make ____ sound
  5. 9. The music staff has 4 _____
  6. 10. The itsy bitsy spider when up the water _____
  7. 12. The beginning of our music has a treble _____
  8. 15. The day before today
  9. 18. True or False: Mr. Walker's daughter has long hair
Down
  1. 1. spaces of the staff spell _______
  2. 2. A music staff has this number of lines
  3. 3. A half note gets ____ beats
  4. 4. This moves around the earth
  5. 5. True or False: A half rest gets 2 beats of silence
  6. 8. This tells us to make a sound and lets us know how long the sound lasts
  7. 11. A quarter rest gets ______ beats of silence
  8. 13. Don't take these beautiful things that I _____
  9. 14. Elephants got big dirty _____ These are the lines of the staff
  10. 16. Music is written/printed on this
  11. 17. This tells us to be silent, but the beat goes on.