Hey Stu, yes i would say you need to get very specific about your folk sub-genre, given the expansiveness of that genre overall. So something like English late 60's/early 70's folk revival, Protest folk, Folk Rock, etc, each of which has fairly distinct boundaries. Then I would suggest that you need to state what your definition is to the group, and we would agree or question the sub-genre. So come smackdown time, your playlists would need to align to the definition that you're provided. Easier for me to think of this in jazz sub-genres, for example cool jazz, or west coast jazz. Make sense?