Music concepts

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Across
  1. 6. gradually becoming louder
  2. 9. for high pitched instraments
  3. 13. the curved lines above or below a note
  4. 14. soft
  5. 16. the layers in a piece. How thick and thin?
  6. 17. very loud
  7. 18. the way a piece of music is put together
Down
  1. 1. refers to the lengths of sounds and silences
  2. 2. for low pitched instruments
  3. 3. high and low sounds in a piece
  4. 4. spaces in treble clef
  5. 5. loud
  6. 7. moderate tempo
  7. 8. worth 4 beats
  8. 10. brisk speed
  9. 11. very soft
  10. 12. value of a quaver
  11. 15. popular string instrument