Note that generative art is not necessarily digital. I used to make generative music using a pretty mundane electric guitar and amp, with a digital delay looper

Note that generative art is not necessarily digital. I used to make generative music using a pretty mundane electric guitar and amp, with a digital delay looper (which I suppose makes it kinda digital). I leaned the guitar against the amp to induce feedback, which went into the looper, which was on a long fade (probably 20+ repeats, well over a minute of music echoing around in there), with modulation to destabilize the pitch. Thanks to the configuration, the feedback was unstable, continuously generating an unpredictable melody of feedback. Kinda loud, but kinda lovely.