Tesla Coils make noise when they are on and generally at a frequency that humans can’t hear however with a little geekery (read: voodoo electronics) tesla coils can be made to emit modulated tones and with enough work music .
Here is the first video I found which has a great jam and the some recognizable themes.
Notice the neon lights at the bottom which are powered by the coil itself.
The themes seem to break off here and one group from Austin came out with some specific performances of Super Mario as a duet and Escape from New York!
There is a lot involved here since the actual frequency emitted is well beyond human hearing capabilities. But by modulating the the power state of the tesla coil they can make it emit tones which humans can hear. A really really in depth explanation was recorded by the Geek Group.
