You might think "what the hell is the point of any of that?" after reading those comments.

Guess what? You'd be right. Modal systems do have a point, but that 7-mode system doesn't.

As far as I know this document of mine is by far the most comprehensive description you'll find on the web of how modes work in folk music. You'd have to dig in some pretty serious ethnomusicological literature to get more.

http://tinyurl.com/scottishmodes