There isn't actually such a thing as folk music because there isn't actually such a thing as the folk.

'The folk' can be defined as a homogeneous group of people who never accomplish much and don't deserve much. Its function is to work, subsist and fight for worthier people who possess wealth, genius or dignity. Its music is bland and predictable.

There is no folk. Humans are variable, and genius, wealth and dignity pop up everywhere.