Do you know lftkryo?
He’s a genius: composer, musician, engineer, demoscene artist… a lot of retro stuff… you name it. He even makes demos on machines designed and built by him.
His latest video is about him turning his C64 into a theremin. Watch it, it’s not only informative but also funny!
… and then have also a look at his other crazy YouTube videos.
All I have to say is…wow. 
He also created the Sixtyforgan, a device for the C64 that emulates the sound of a church organ:
And here is the technical video about how he designed the device, also containing more music.
I like it. It’s basically done with only a spoon, a clamp and two 555s.
This is just brilliantly insane.
I want it!
Another new addition to the C64 orchestra:
