I was pretty disappointed when I tried some basic music theory questions. There's plenty of music theory information out there in text form, but it couldn't reliably tell me the tritone substitution of an F7 chord. I explained all the reasoning behind it to the point that it could parrot back the right answer, but then it made the same errors when I asked for the tritone substitution of an Eb7 chord. I wonder if that's improved with 4.