Trollheart

What a cool handle!!
Very good point, in fact: a lot of as you say "roots" acts do push the envelope in instrumentals, even traditional Irish or Scottish groups can pull off some amazing tunes.
And I'm sure, with that handle, you'll agree that there's a certain gravel-voiced singer who can make ANY instrument do things and make sounds it never even thought it could! I think one of my favourites by him, though of course not as experimental as his later stuff, is "Rainbirds" from Swordfishtrombones --- a truly unique piece of music: understated, simple and elegant yet SO different, quiet but yet screaming with the roar of Waits' innate genius.