That is allowed ~M~. There are many definitions that are appropriate for a particular song, singer or local environment. That is why there are always these long arguments.

It is not that the 1954 definition is wrong, just that some of us think that it is incomplete. It also suffers from the fact that some researchers, like Bruce Olsen, have found earlier published versions of many folk songs which once would have met the 1954 criteria.

Another indication that a song may be headed in the direction of Folk, is when a member of the audience requests it. It means that a song is memorable enough at that location that somebody wants to hear it again.