Bass or Treble?

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Across
  1. 2. very low instrument
  2. 4. what you read to play
  3. 6. 4/4 _____ fill in the space
  4. 7. a guitar has six of these
  5. 9. drums, symbols etc.
  6. 10. instruments you blow air into to create a sound
  7. 11. the speed at which a piece is played
Down
  1. 1. the first instrument ever created
  2. 3. what the conductor conducts with
  3. 5. what you play your music on
  4. 8. someone who writes music