Nice quiz. "Fantasie in A minor" is rather vague - many composers wrote a Fantasy in A minor - the first to come up on a google search is actually Wilhelm Friedemann Bach. Might be better to have something like Kinderszenen, or Träumerei, to link it more clearly to Schumann.
Hey there kiwirage, thanks for pointing that out. Sorry, Fantasie in A Minor is very vague, come to think of it, and I've replaced it with one of your suggestions. I've resubmitted the quiz and hopefully it will be accepted and changed.
I would suggest a harder version- yellow boxed answers. You could get most of these composers just by knowing names, rather than by what piece they wrote. These are some of the most prolific composers ever. Love the concept however and hope you do more!
by the way, could you be a bit more easy on the spelling of russian composers...pleeease!