Sound? Most likely. Relatives? Yes.

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Across
  1. 3. What everyone is doing at Harry Nilsson
  2. 4. Number of verses in Elliott Smith's "Twilight"
  3. 5. The Flying _______ Brothers
  4. 7. One of the two songs on "Ten" in Open D tuning
  5. 9. The Deleo brothers play for this abbreviated band
Down
  1. 1. Most popular song from "Make Yourself"
  2. 2. Seventh song on "Darkness on the Edge of Town"
  3. 5. How Brian Wilson is feeling about his Old Man
  4. 6. The message on Flea's fist
  5. 8. Sting will send one to the world