Don't know if this has already been addressed: have had occasion to listen to several choruses doing BALKAN music. There is harmony that will straighten a slumped backbone. You must perforce sit up in your seat, if not sit forward trying to lean into the music. And your eyes get big and someone has to poke you and remind you to breathe. If I had technical grasp of what it is, I'd have it in my church choir -- at least sometimes.

And the guys who do "The Rolling Mills of New Joisey" get some strong harmony going. Some more eye-opening, back-straightening sounds.    Tw