Creators of the original Singing Tesla Coils, the crew of ArcAttack uses high tech wizardry to present music in a whole new light.ArcAttack employs a unique DJ set up of their own creation (an HVDJ set up) to generate an 'electrifying' audio visual performance. The HVDJ pumps music through a PA System while two specially designed DRSSTC's (Dual-Resonant Solid State Tesla Coils) act as separate synchronized instruments.These high tech machines produce an electrical arc similar to a continuous lightning bolt which put out a crisply distorted square wave sound reminiscent of the early days of synthesizers. The music consists of original highly dance-able electronic compositions that sometimes incorporates themes or dub of popular songs.Joe DiPrima and Oliver Greaves are the masterminds behind the design and construction of the Tesla Coils while the music is developed by John DiPrima and Tony Smith.
I'm not sure if it was resonating the sound wave or not...
This is most likely. I have also seen this, sort of thing, done with fire.