"Can you please point out where it is claimed that a community can consist of two people, folkloric or otherwise?"

I could be wrong but I seem to remember Jesus being quoted as saying something about "wherever two or more are gathered, so am I there with you." Sounds like community to me.

That aside, I do see where some folks might claim that there is "the tradition" as opposed to "a tradition". I think it a particular insular use of the word but I understand where you are coming from.

I consider myself a traditional singer as I have passed on songs I learned from my father who learned them from his father as well as learning and sharing songs from other people who learned them from other people.... Still, I don't really bill myself as a traditional singer as I don't want to disappoint anybody who might be coming expecting me to sing a whole evening of "come all ye's".