I've added a simulation of a classic Theremin electronic musical instrument to my Metaverse Machines showroom. Here's an example of one in action:
If you have a VR headset and two hand controllers, you can play this yourself. It's ugly and it's not a perfect replica of the real thing, but I mainly created it as a technology demonstrator.
If you find yourself addicted to playing with this, please let me know. We'd love to hear you play something fun for us.