Unknown to myself, there is a unique subset of individuals who indulge in the "Singing Tesla Coils", to the point that they actually go on tour (go figure)! A YouTube search provided about 10-15 items of said topic, but I think I've chosen one of the better (and briefer) productions. If you wish to see more about this topic, please visit:
or visit YouTube and search for "Singing Tesla Coils".
(The above was Filmed at the Greenmuse Cafe in Austin, TX. Joe DiPrima and Oliver Greaves demonstrate singing tesla coils.)
*Note to the Earl of Primbroke - my apologies, I inadvertently deleted your comment! If you wish to repost, please feel free to do so!