"Contemporary society has changed the definition of folk music."

Sorry, no cigar. A few members of contemporary society (some of whom have a vested interest in giving their work a legitimacy that they would not possess otherwise) would like to change the definition of folk music to something much looser, fuzzier, and more indefinite, so they can include anything they want to include, whether or not it meets any established criteria beyond their own wishes. But—until they get far more general agreement than they have now, the definition remains unchanged.

Don Firth