The Tuvan group Yat Kha might appeal to those fascinated by overtone singing. They combine traditional Tuvan instruments (and, of course, the spectacular singing) with rock guitar. When I saw them they reminded me a bit of Captain Beefheart. Not to everyone's taste, perhaps, but a wonderful group of players and singers.

More about them, and a chance to download some MP3s (including a frightening version of "Wild Mountain Tyme" here

Norman