[Houshalter]

This isn't quite what you are looking for, but here is one trained on midi files extending let it go: https://ericye16.com/music-rnn/

Here is one trained to predict the next byte in an wav file: https://www.youtube.com/watch?v=eusCZThnQ-U

[userbinator]

That YouTube one is a good approximation to what I hear if I leave the radio turned on in the background and playing music, but am not paying attention to it and focusing on other stuff.