i was just looking around YouTube and stumbled on this:
Akumainzer 3!!!
If you are bored enough, play the Konata version along while watching the live concert video and try to synch it in time with each other. Then mute the YouTube vid and it looks like the dude is singing in Kona's voice.
The good thing is that the concert is the same tempo and is constant. So you'll get perfect timing with Kona's version.
It takes a bit of patience and alot of pause/play pressing to get the synch right but it pays off in the end
Laughed for hours
edit: Decided to make it easy for you guys:
Enjoy!
ps: Can also be done with 'Sore ga, Ai Deshou'. YouTube vid has good synch...ness