Name the concept

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Across
  1. 2. the speed of how the music should be played
  2. 3. gradually becoming louder
  3. 6. 1/4 beats
  4. 8. refers to the lengths of sounds
  5. 9. very fast
  6. 11. a whole note
  7. 12. Relates to the number of instruments performing in a piece
  8. 13. a half note
  9. 14. refers to highness or lowness of sounds
  10. 15. very slow
  11. 18. a quarter note
Down
  1. 1. gradually becoming softer
  2. 4. refer to the loudness or softness in music
  3. 5. Fast
  4. 7. an eighth note
  5. 10. a regular repeated pattern
  6. 11. refers to the form or plan
  7. 16. a group of instrumentalists
  8. 17. the basic unit of music
  9. 19. colour refers to what is being played