Yes, Fred, we agree, though I'd rephrase to say that a "ballad" is definable to the point of being a useful category, but which songs qualify will often be debatable. A "wolf dog" (I've seen them) is half and half, neither nor. Breeders don't fret about the label because it's not important. Knowing that "wolves" and "dogs" exist, however, and that there's a difference, is extremely important.

The sentence about tyranny was addressed not to you, but to an earlier statement that "Child has a lot to answer for" - unless that post was intended as irony. I've re-read it and confess I'm no longer certain.