Wow, a great concept and execution, as I can imaging how daunting programming an AI can be (or I guess rather pseudo-AI), but also how interesting it can turn out. This is really a concept you really should develop further into a series (they don't even have to be connected with more than having an AI present). A good and new direction for games to go! Inspiring.
Why do you keep adding those horrible drums and bass on the tunes?
This could be a very good game - fitting art, nice gameplay - but the arrangement of the tunes is so unmusical as possible (bad rearrangement, not tight, and sometimes the harmonies just doesn't fit (and yes, I'm now this, I am a jazz pianist)).
It made me me ragequit. Not because it's hard, but because the musical arrangement is horrible.