It's a demo of my dad's new Voice Box (harmonizer/vocoder) as performed by a pair of really talented folks I found via YouTube (I found Jack and Nataly when researching user-generated videos for the new EHX site).Voice Box Demo by Jack Conte and Nataly Dawn
The Voice Box's harmonizer is vaguely like Songsmith, in that you feed it a mic and an instrument, and it can then create multipart vocal harmony -- the vocoder is totally different, it give more of that robotic man-machine sound.
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Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.