Well, I know that there's an hum of around Bb that surrounds us
   in parts of the world with 60hz electricity; we barely even
   notice the sound of motors humming along most of the time, or
   the sound of electrical lines over head or underground.
   *
   Not sure about the Universe; although perhaps some testing
   equipment that _doesn't_ run at 60Hz that's out in space _might_
   effectively detect it... but the noise is so pervasive that
   simply being measured or processed by _equipment_ that's here on
   Earth will have the potential to be suceptable to that
   influence, even if it's filtered out. [how do you know if you're
   filtered out enough to account for Florescent light balast noise
   and such, etc).
   *
   I love the low notes on pipe organs; and I'm somewhat envious
   that you had that as a task at one time of your life.
   *
   The organ at my church growing up had been converted to electric
   in the 60s, and when I was a custodian as a teenager there, I
   used to wander around, and I loved walking behind the parts few
   else see, going through cubbyholes to where all the gigantic
   racks of gigantic speakers with massive magnets were at.
   *
   Very peaceful spot. All this potential for 'loud', sitting
   behind it, yet all was quiet. Loved it.