Who is Stevie Wonder?

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Across
  1. 4. Grammy Awards
  2. 5. What year did Stevie Wonder release Happy Birthday?
  3. 6. Number One R&B and Pop Singles
Down
  1. 1. Top 40 R&B and Pop singles
  2. 2. What album was Happy Birthday apart of?
  3. 3. What age did Wonder start playing the piano drums and harmonica?