With the use of a Tesla Coil they can reproduce near perfect audio quality.
Using a XenoSonic audio interface it's also possible to use the audio output from an instrument to control the Tesla Coil sound.
Got to be good fun for any gig/set

http://www.easternvoltageresearch.com/
http://www.youtube.com/watch?v=BiUlqecQKUo
http://www.youtube.com/watch?v=KSNQgoaEHNI
http://www.youtube.com/watch?v=UGD64MjRTfA
http://www.youtube.com/watch?v=WOTCUyb6PDM