The major issue I can foresee going forward is that the only public domain sheet music available is in the classical idiom. And people don't really care about writing new pieces in a Baroque style. It's a fun exercise, but not really relevant to modern music. The "pop music" listed in the article sounds like "Baroque-pop" presumably because that's what is in the training data. That's why a DAW style system would be more useful and welcome, although there again - what data do you train on? There aren't just millions of publicly available "EDM DAW files" laying around to train on.