Video: Electrifying Rendition of Super Mario Bros. Theme

Singing Tesla Coil = neat. Tesla Coil singing the Super Mario Bros. theme = nerdtastic. It happens about halfway through the video. Here are some answers to the science-type questions:

This is a solid-state Tesla coil. The primary runs at its resonant frequency in the 41 KHz range, and is modulated from the control unit in order to generate the tones you hear. So just to explain a little further, yes, it is the actual high voltage sparks that are making the noise. Every cycle of the music is a burst of sparks at 41 KHz, triggered by digital circuitry at the end of a "long" piece of fiber optics. This Tesla coil was built and is owned by Steve Ward.