I suspect it's accompanied by some speakers too, because otherwise the sound would be a lot "emptier" and less bassy.

Similar device: https://en.wikipedia.org/wiki/Plasma_speaker

Also reminds me of this old video: https://www.youtube.com/watch?v=b9UO9tn4MpI

You can pretty clearly hear the drum and synth parts playing in the background, at least. I don't think they're trying to conceal it.

In Portland there's Quarterworld Arcade that does a few musical Tesla coil shows every week. https://www.youtube.com/watch?v=Fb6MyRPQRPM

Direct Video Link: https://www.youtube.com/watch?v=bbLshnfu0wY

In honor of Alabama's impending loss to LSU, I present ArcAttack! playing the Imperial March on Tesla Coils and a human being.

https://www.youtube.com/watch?v=6OdubOdFS-Y

Also, Sharon Osbourne gets boo'd.

Saw these guys play at DragonCon a few years back, and it was the bomb. They also played a bunch of chip-tunes through the coils, which seemed to work extra well.

I heard the band called "Arc Attack" do this about 10 years ago in Austin, TX.

The video is ok but listening to it in person, up close, is something else entirely. The sound-generating surface is physically huge, so the sound fills the space in a way that is hard to describe. If you're into the chiptune genre to begin with... It's great.

Here is a video of Arc Attack: https://youtu.be/huuevMwp1wg

IIRC the drum was played by a robotic drum kit and they had a dude in chain mail dance in the middle.

This is a good song for the Tesla Coil

https://www.youtube.com/watch?v=Ee5evlN8Bbs

Curiously reminiscent of the Moog Cookbook’s version. https://www.youtube.com/watch?v=6vaThIiLlm8

At Burning Man 2018 someone hooked up two massive Tesla coils to a keyboard and you could see and hear the notes as electricity as you played them on the keyboard. One of my favorite memories :)

Do we live in a marvelous age or what?