According to Jim Carroll, if you buy a tin of salmon etc...

Well, if you have been listening to folk music for years and years and you then buy an album expecting folk music but you get folk music instead?

I shall happily listen to Dave Burland with his guitar and silky voice singing A Sailor Cut Down in His Prime, and I call it entertainment but whilst acknowledging the contribution Harry Cox made in ensuring the song has a new audience, I don't exactly call an old man crooning out of tune into a cheap microphone entertainment. Provenance yes, but we all have our particular ideas.

Led Zeppelin singing Gallows Pole is rock. An old traditional song can be rock then. Just as a Vin Garbutt song written last year can be folk.

It isn't difficult. They are all music. A folk style? Quite a few of those to go at. Warbling into a guitar c/w harmonica, mumbling with your finger in your ear, guitars, bass and drums, fiddles, bodhran and pipes, even banjo if you must stretch a point.