This is Jonathan Coulton:
Listen to JoCo playing Portal 2's ending theme song! [Warning! Spoilers!]
Playing Want You Gone (& Still Alive) and failing at that XD
No seriously though, it's always fun to listen to him struggle on his own tunes~
Classic Jonathan Coulton XD
But it's the way he plays naturally and sometimes misses that is fun with the guy!
Here's same vid', different angle (and sound quality):
And since I'm already spamming you guys with this video, here's one more:
And now Want You Gone@ another concert (no errors this time):
:)