Music & sound

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Across
  1. 2. expression of emotion
  2. 6. degree of highness/lowness of a tone
  3. 9. sound is produced by being struck or scraped by a beater
  4. 10. Greek philosopher
Down
  1. 1. sound is produced by vibration of air
  2. 3. unit used to measure the intensity of a sound
  3. 4. simultaneously combining a number of parts
  4. 5. rate at which something occurs or is repeated
  5. 7. degree of loudness
  6. 8. basis of harmony
  7. 11. unit of frequency