I don't buy the bit about the music response trigger. I can't recall any time that I've got the "this music is friggin' awesome" goosebumps when I hear some piece for the first time. Instead, I get them when I'm very intently listening to some favorite song that I've heard many times before, and particularly during my favorite bits of favorite songs. That throws "unexpected shifts" in the music as a cause right out the window -- I anticipate those bits coming and then the enjoyment/realization of that anticipation seems to be the trigger.

Agreed, totally. In fact most of the music that gets to me is powerful but often slow. I even get goosebumps just thinking about some music.
This doesn't even remotely address the physical sensation of the "frisson". Plus if it's supposed to be fear based, why does it feel so damned good?

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