"anyone who goes to a Folk Music Festival and has to listen to a rapper between Irish folk bands and bluegrass is being abused."

Anyone who goes to a buffet and fills up on bread just wasted an opportunity. Likewise, you do not have to eat everything put in front of you.

Folk Festivals are the creative vision of an artistic director. If the director attempted to cover ever single tradition, they would create a confusing event that would struggleto convey the vision.

I don't think rap would fit in well at the major festivals here in the U.S., but that does not alter its classification.