Frank,

You said:

"I have for example noted certain 'involuntary' body movements associated with the practise, and appreciation of folk music. Random, incoherent mouth noises that do not serve any obvious purpose, yet seem to transmit some sort of egregious, sublime communication to the receivers."

Your question about the effect of folk music necessarily brings up a very old topic: What Is Folk Music? This is a question that has been discussed to death in many places, including many Mudcat threads, and I'm not suggesting that we discuss it here. However, you seem to have an idea of what you mean by the term, and I think it would help if you defined it more precisely. After all, Scottish bagpipe music and Tuvan throat singing are both undeniably forms of folk music, but I don't think either of them is what you were thinking of. At what kind of 'folk music' performance have you seen these involuntary body movements and random, incoherent mouth noises?