I caught this one from my twitter feed thanks to @funscience. The video is long and if you want to skip to the awesome bit – giant Tesla coils making the Doctor Who theme song then skip right to 6:43 in the movie.
Really though, it’s worth watching the whole thing to understand what this team of people have put together. It’s pretty wild stuff ionizing the air to act as speakers. The bolts of lightning in miniature makes it all complete.