This is probably pointless to point out, BUT... There are many contexts for the use of the adjective "folk". It can be stylistic, historical, sociological...

most of this argument (aside from the "never heard a horse" and the "I like it" idiocies) resembles a heated debate on whether an elephant is an animal, a vertebrate, Asiatic, a beast of burden or a pachyderm.

Come to think of it, a lot of "folk" acts I've heard in recent years would improved by having horses do the singing.