I thought the original point was about organization rather than definition?

Folk clubs do mostly have rather visible committees, compared with the institutions that put events on in other genres like classical, pop and jazz. Those tend to have more authoritarian structures - they're either capitalist enterprises or else grouplets set up to operate a bank account for charitable or governmental funding.

By contrast, the folk scene (in the UK, at least) tends to use structures inherited from socialist political movements, whose holy writ has always been Roberts's Rules of Order. It does at least make some effort at democratic organizational form, if not always very enthusiastically. A rock promoter or opera company will do nothing of the sort - everything runs according to the Führerprinzip.

Leeneia's remarks about 20th century art music are preposterous. I'll reply about that later.