Zeusaphone is a rare Musical Instrument that you might not have heard of. It plays music with lightning and is also known as Thoramin or Musical Lightning. Zeusaphone is a form of Plasma Speaker. The principle of working of a Zeusaphone is by modulating the Spark output of a Tesla Coil, creating a shocking effect.
Zeusaphone modulates the Electrical Spark output producing a low-fidelity Square Wave, that can be musically manipulated. The high-frequency signal acts in effect as a Carrier Wave. Its frequency is significantly above the human-audible range of sound frequencies so that a digital modulation can reproduce a recognizable pitch. The Musical tone results directly from the passage of the Spark through the Air.
It is developed by a company named Zeusaphone LLC. The concept was trademarked in 2007. There are different models available now.