I'm still on my overtone singing kick: here's Alexander Glenfield demonstrating the seven styles of Tuvan Throat Singing, a method of singing which produces sounds that no human throats should be able to make. It's like having a flute inside your throat!
The overtones can be subtle - if you don't hear it, you may want to upgrade your computer speakers. Hit play or go to Link [YouTube]
Previously on Neatorama: Kongar-ol Ondar the Tuvan Singer
Alex, can you overtone sing?