Sit, Ubu, Sit. Good Dog.

I dig this video.

But I was surprised to learn that this is just one very talented guy, not twins, because the one on the right seems to be cuter. I showed the link to my mom and sister and they agreed. We then tried to isolate and identify why the same guy would appear to be his own more attractive brother. Is it that playing the guitar is somehow more happening? Is it the white shirt (maybe like a Darth Vader vs. Luke Skywalker thing? Or Spy vs. Spy? Or simply fashion?)? Or does he maybe have a bit of scruff on the right? Whatever. It's a fun video. Enjoy.

Can you identify what the title is from? Hint: It's not a theme song.