Mr Harcum's music room puzzle

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Across
  1. 4. How many letters are in the music alphabet?
  2. 6. You should (blank) the mic?
  3. 7. The time(blank)is the second symbol in a musical sentence.
Down
  1. 1. This symbol is at the beginning of a musical sentence?
  2. 2. Placing rhythms/accents where they normally wouldn't be.
  3. 3. One two (blank)and.
  4. 5. An African drum with an hourglass shape.