The sound doesn't actually start until about the 30 second mark, i.e., at the end of what would be the instrumental intro if you could hear it. So be patient -- it's worth it.

I was originally going to title this post "Monday Moment of Creepy," but I thought better of it.
I should also add that the more I ponder Jefferson Airplane of late, the more it occurs to me they had far more in common with the punks that followed them then they've been given credit for.