Overtone singing.
Bloke sings one note, then manipulates his mouth to give upper and lower harmonics.

I've been doing it for quite a while (in more of a Tuvan Sygyt/Kargyraa style) and I have bought the Overtone Analyzer software he uses too, and it's brilliant fun.

Listen to the last three minutes and you'll be very surprised at what the human voice can achieve.
( moohalaa, Thu 28 Aug 2008, 0:03, Reply)

haha, bald

( Gilgamesh would "like to fuck" sue perkins, Thu 28 Aug 2008, 0:15, Reply)

Oz Clarke
when he's off the wine
( masakatsu, Thu 28 Aug 2008, 0:17, Reply)

I like that.
Where'd you get the Overtone Analyzer from, by the way? I might be interested in aquiring that there piece of software.
( The Gentleman Bastard is in ur noun, verbing ur noun. ©, Thu 28 Aug 2008, 0:26, Reply)

overtone analyzer software
by Bodo Maas and Wolfgang Saus. woooo, im gonna mess the local karaoke right up !
(OneTonTesti master of rubbish kung fu, Thu 28 Aug 2008, 8:50, Reply)

Argh!
Mantrid! *runs*
(jonbob fucking hates horses., Thu 28 Aug 2008, 1:09, Reply)

sings?
more like hums and moans.
human didgeridoo!
(discodaz sponsor my tash! see my profile, Thu 28 Aug 2008, 2:34, Reply)

I like whistling and humming at the same time

(mookay pick em up picklehead, Thu 28 Aug 2008, 9:19, Reply)