I tend to gravitate towards electronic music when I'm working. There's something about the order and structure of the beats that keeps me productive. And more often that not, it's The Chemical Brothers pounding away in my headphones.
The app itself is very neat. You can play back synth guitar versions of popular songs by just tapping on chord buttons on your iPhone. What makes this video is the composition and the editing. It is AMAZING. Seriously, just watch it.