In October last year I participated in a live group performance at a culture house in Oslo called "Kunstnernes Hus". The performance, "Wave needs time to wave" included many different performers who played music, dressed in weird costumes, danced, smokes, and projected video.
I decided that I wanted to try live coding pixel shaders using shadertoy. Being my first time live coding I didn't really know if it would work out or not, but it actually went good. I coded for about 1 hour, while projecting my screen at the wall. I used the microphone on my laptop to capture the live music being played, so that I could write visuals that reacted to the sound.
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The interesting thing about writing live code is that I kept changing the visuals until I was either bored or satisfied of that particular visual and created a new one from scratch. Then finally I made the shader show each effect after each other.
You can access the code and see a realtime version of the resulting visuals on shadertoy with different music than in the performance: https://www.shadertoy.com/view/4lKGWy
One of my colleagues filmed some parts of the performance, which I edited together to a small video (thats me with the red hat):