The Triadex Muse was a digital algorithmic music composer invented in 1969 by Marvin Minsky and Edward Fredkin at MIT.
The Muse is incredibly rare; one report claims that only 280 were built, and a small fraction of those are likely in working condition today. And that's a shame, because this was a remarkable device and we can learn much from it.
This is a Javascript simulation of the Muse that runs in a browser.
Please enjoy!