Woody Guthrie is a real challenge to the academic who wishes to categorize everything and everybody.
Nuff said.........
We do seem to straying into songs so. To me songs are a bit like houses. Peoples needs and tastes in houses are different.
Some will move in to a house, just how it is, some will knock them around a bit first and some folk need to build from scratch. We can all agree perhaps that they are houses, and important to us.
It is the same, I would suggest with songs.