I stumbled across Jerobeam Fenderson’s YouTube channel a while ago and I was fascinated by his work. He probably creating the field of “Oscilloscope Music”. Before, there were just Lissajous curves.
In a nutshell, you connect the left and right channel of your audio source to an oscilloscope while playing it through an amplifier. Set the oscilloscope to X/Y mode and the oscilloscope will draw a picture according to the instantaneous audio voltages. But the art is to create audio signals which draw a nice picture and create an equally pleasant sound.
Check out the result: