This is fun. It actually feels like I'm taking turns with someone else on the other end of the screen who takes what I play and sends back a riff on the notes.

This is fun. It actually feels like I'm taking turns with someone else on the other end of the screen who takes what I play and sends back a riff on the notes. The trick is (as the little intro shows) to only play for a few seconds, don't play simultaneous notes, and then stop and let the AI respond. Once the AI has finished, you can try again. If the AI starts playing before you're done, you've screwed up and should make your little sequence of notes shorter. Basically, the title of this is misleading... if you keep playing expecting the AI to join you in a simultaneous duet, it'll sound like cats fighting inside a piano. Try playing the "Dukes of Hazard" horn: on your keyboard, press (without overlapping the keypresses) "LJGGGHJKLLLJ" and let the AI respond. More often than not, it'll come back with a vaguely pleasing riff on that sequence using mostly the same notes and in the same tempo.