3. Music

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Across
  1. 3. a musical interval embracing eight diatonic degrees
  2. 5. a case where a rule does not apply
  3. 8. a highness or lowness of a sound
  4. 11. a person who is an expert in mathematics
  5. 12. in a clear and detailed manner, leaving no room for confusion or doubt
Down
  1. 1. without apparent external cause or stimulus
  2. 2. in a very complicated or detailed manner
  3. 4. a continuous slight shaking movement; a series of small, fast movements back and forth or from side to sideor
  4. 6. a person who makes or repairs things made of iron
  5. 7. relating to what is real rather than to what is possible or imagined
  6. 9. to adjust (a muscial intrument) so that it makes the correct sound when played
  7. 10. a heavy iron block on which heated metal is shaped by hitting it with a hammer