Tesla Music at the Maker Faire! Answered

So today I got a sneek peek of the Maker Faire at Young Maker's Day. And with it, something that simply blew me away. This tesla coil demo uses two TALL towers with lightning bolts coming out the top. The lightning bolts are what make the music! And the drums are robotic! That's what's waiting for all who are coming over the weekend. Enjoy! I included a video.