I know nothing about J-pop, but the other day I saw a YouTube video of Hatsune Miku live.  It's a hologram of sorts, with an electronic voice (sampled from a live woman), that can perform with a live band, singing and dancing on stage.  It doesn't look like a real person (though the headset mike is a nice touch) but it's not supposed to--and it does move and sound like one.  

Apparently they've been around for a few years, so perhaps I'm the only one who's never seen the things before.  But I am fascinated by them.  This is what 3D tech should look like--something you can walk around, the Millennium Falcon chess game sharpened and writ large.  This is the future I've been reading about all my life. 

I do wonder what the musicians think of performing with something like that.