Hedningarna is pretty interesting. If you're getting this in an email or an RSS reader I think you have to click through to see the video.
Now don't get too excited about this video because it's just a still. Yes, spoiler alert, it never changes. But getting 5/4 to rock out to this degree is pretty impressive.
The folk-song singing style probably has a name. I always think of it as the anti-bel canto style but I'm sure that's totally inaccurate.
I'm looking for inspiration for The Imaginary Opera and there's a 6/8 thing in Apocalypse Now (when the boat first arrives at Kurtz' compound) which has a similar feel in the bass.
And, of course, I love those chromatic changes.