What does "super human" mean for a cultural artifact like music? With a game, "super human" can mean "beats humans". For supervised learning, where there's some label other than human opinion, "super human" can mean "more accurate than a human labeler". But for music composition, you need a difference source of information (listener ratings? sales/streaming plays?) to determine what "better" means, which would be a meaningful structural change rather than just an extension of this technique.

So long as the training set only tells it what human-composed compositions look like (MIDI files of existing music), a system has no signal to find "super human" territory.