An odd post here about a new and— to some people, probably exciting— way to send clandestine signals using publicly broadcast pop music. Hooray.
The music of Queen and Van Halen are listed as prime candidates for such data delivery.
Evidently, this technique could also "support covert information gathering or to coordinate a multi-point terrorist attack". Yikes..
The blog post also includes a link to a quiz to see how well you can identify audio watermarks, in case that's of interest.
O brave new world, that has such unease in it.