Folk purity is about normal lives in a big and often uncaring universe, not just authenticity to ploughing and shipbuilding.

I'm not sure I like the term "folk purity" but I do not base folk on words. To me with new material, it's whether or not it feels it belongs or follows on naturally from the material we know from the past.

A difficulty I have with the use lyric content and meaning to define folk is that that overlooks the fact that a fair chunk is tunes and dances.