The problem is that this experiment might as well just replay a random collection of the N most recent notes played, with durations shuffled around, for all the musicality it demonstrates. He wired a neural network to some midi samples, and it didn't generate anything of use. Yeah, it was an experiment, and there's value in failed experiments, but you don't typically make a big website to present your failed experiment.

Maybe if you could set it to "Blues" or something like that, switching training sets, it would do better, but as is it's a nonsense generator.