My immediate reaction was to try and confuse it, so I played "Roll Call" from the Thomas show (kids are obsessed !) It's a bit chromatic so I thought it would have trouble, which it did.

Next, I tried putzing around on the white keys but made sure to never hit a F or F#. I wanted to see if it would try and guess which key I was playing in, C or G major. It seemed to guess C most of the time, though one time I tried hinting at G by starting out on G, it got confused and starting playing both F and F#.

I was just clicking with a mouse, so rhythm was hard to judge but overall this thing did a really bad job "complimenting" my playing!