Arc Attack from Flipside 2008. 

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 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. 

Impressive and strange!

via CheeseBikini