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People I'we shown my paintbrush suggested adding music to it.
I rejected it as too hard but feeding it the music as a basic shape with the help of minim works out.
Here's the project in a .zip, sorry I'm not using github -> dancing_pixels.zip download
You'll need the minim library and "some graphics" to run.
Also nothing will happen until you press the P - key
No music in the download, just a nonsense sample, add your own music or do whatever you want with it.
Thanks everyone who helped me achieve this.