I remember my piano teacher playing some of Frédéric Chopin's Fantaisie-Impromptu in C Sharp Minor, Op 66. This was the versions from Will Harvey's Music Construction Set. It's much easier for a computer to rip through some proto-midi than for a human being to learn some Chopin. She deserved much credit for a ornery pupil.
I spent much time playing with the Music Construction Set: not really composing music, as that was beyond a untrainable ten year old. Rather, soaking in the synthesized notes and early electronica.