Singing by oneself

I saw the video above on AAM.  It’s a video of Sam Tsui, who is Yale student, and who made a Michael Jackson medley with his friend Kurt Schneider (the guy on the left doing the beat box thing).    It’s Sam Tsui times six, with Kurt doing the beats.  The first time I heard someone sing by himself on separate tracks was when Bobby McFerrin recorded Don’t Worry, Be Happy.  Sam and Kurt’s piece is pretty cool though because of the visuals.  How do they make a video like that?

Also check out their rendition of Journey’s Don’t Stop Believing:

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