I came across a "What color are piano keys...black and white or ebony and ivory" in the 7+ (easy) questions. That question is a little bit questionable (considering all of these are elements having to do with a piano).

Also, I think I heard "tech" pronounced as "techhhhh (as in Chevrolet)...maybe when I was offered Science and Tech as one of the categories.

I love this game, it's such a great development! Well done!