Apparently I am a little late to the game on this one, but I just stumbled across 2 Cellos. If you also find yourself out of touch with that bit of current popular culture, you have to watch this video.
It gets better. After someone showed one of their videos to Elton John, he hired them for his band. And it has only grown since then. They have a big pile of videos available on their youtube page featuring everything from Guns ‘N Roses to Michael Jackson. It’s well worth a look.