It's certainly very interesting. It's a slight improvement over Markov chain music. That tends to sound good for any stretch of 5 seconds, but lacks a global structure making it pretty awful to listen to for any longer stretch of time. This music still lacks much of the longer range structures that make music sound like music. It's a lot like stitching together 5 different Chopin compositions. It is stylistically consistent, but the pieces don't fit together.

Having said that, it is very interesting to see what you can get out of a network with respect to consonance, dissonance, local harmonic context and timing. I'm most impressed by the rhythm, it sounds more natural to my ear than the note progression.