What Am I?

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Across
  1. 3. I fell and twisted my what?
  2. 4. Song of Music.
  3. 6. Mandela spoke a lot about what?
Down
  1. 1. Matthew, Mark, Luke, John.
  2. 2. Lightning and what?
  3. 3. Subtraction
  4. 5. The middle street light.