Me too. Here's some thoughts that are probably wrong: They've
  measured a supermassive black hole as spinning at 1/2 the speed
  of light. We'll go with 150,000 m/s (wicked rounding there). At
  first, I calculated the harmonic frequencies but unfortunately,
  at the VERY FIRST harmonic, you end up with the speed of light.
  Crud. Apparently can't go any faster there. So, a different
  tactic: What's another feature of black holes? GRAVITY. Gravity
  slows down time. I'm thinking: Should you be able to get a
  monitoring instrument to record a black hole at JUST THE RIGHT
  DISTANCE away... ..you could find a "sweet spot". In that sweet
  spot, the apparent frequency of spinning would be slowed down
  enough by gravity's time effect to bring the pulses (hertz) down
  to audible human range. I could be wrong about this totally.
  Again, I'm thinking sweet spot. You'd have to be a particular
  distance away from the monitoring unit which would have to be a
  particular distance away from the black hole for this to work.
  But at that sweet spot, where your location, the location of the
  "ear" and the spinning dark star, you could hear the song it
  sings.

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