Music Theory puzzle

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Across
  1. 2. the quality of the note
  2. 3. 2 beats
  3. 5. 3 or more notes played together
  4. 7. lines of the bass clef
  5. 10. 1/2 of 1 beat
  6. 12. lines of the treble clef
  7. 13. silent beat
  8. 14. spaces of the bass clef
  9. 17. 3 beats
  10. 18. the beat of the music
  11. 19. one beat
  12. 20. 1/2 of 1/2 of a beat
Down
  1. 1. the highness and lowness of a note
  2. 2. the speed of the music
  3. 4. 8 notes arranged in order going up and down
  4. 6. 1 1/2 beats
  5. 8. the volume of the music
  6. 9. 4 beats
  7. 11. 6 beats
  8. 15. a group of singers that sing together
  9. 16. spaces of the treble clef