Electricity Sings! Who Knew?

I'm going to have to admit something embarrassing right now: I watched America's Got Talent.  I felt like a Roman watching the circus, strangely titillated while waiting for the Thumbs of Death to show up.  Let's face it: we are the new Romans.  Crazy things come up on stage, like these guys who generate electricity while Darth Vader's theme is playing in the background.  What I later found out was that the machine they used is called a Tesla Coil and you can actually play it like an instrument.  The result?  Electricity sings.