Mark’s birthday crossword

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Across
  1. 1. Primary
  2. 6. The study of sound in physics
  3. 9. Important to both visual and performing artists
Down
  1. 2. You may pass
  2. 3. Inspired by the muses
  3. 4. Organised, uniform, steady walking
  4. 5. Working all together
  5. 7. Not at the edges
  6. 8. The largest type of cetacean