I like your comment about Jailhose Rock.
A few months back at our club we had a guy get up and sing a typical Fifties song, A couple of other guys got up and joined in and between them they treated us to about half an hour of Fifties stuff complete with all the Shawa Shawaas. I don't remember all the titles but they were great.
My point is, that, because these songs are still being sung they are pretty good candidates to be classified as folk.
I like 'traditional' songs and sing many of them, but also consider it my duty as a folk singer to sing any song that I think should not be forgotten.
A more interesting discussion might be ... What is being sung in your folk group? ...
What I am seeing (or rather hearing) is a mixture of traditional, old time, music hall, sixties psuedo-folk, country and old pop. All of which seem to be accepted as suitable even if they don't fall within any one particular definition.
Come on Elsie, we need your opinion here as well.