I like the coach song & football song examples. These are situations where people sing together, sing songs they all know & have the opportunity to make the odd change to them as they go. My point is that there aren't that many of those situations left - and there are a lot more situations where music is available on tap.

even though they might have stopped doing that, what they do is still Traditional Folk Music / Song

This is a statement of faith, no more and no less. It's still Traditional Folk Music / Song because...?