Good quiz but some of your answers may be a bit too specific. For example I tried record labels, record companies and other variations before I thought of the genre. Also horses, race horses...before I thought of the more specific answer. Same with Radon, Krypton, etc. Yes, your answers are correct, but what I'm saying is that there are more general answers for these questions which are also correct. I guess it just depends on how difficult you want to make the quiz.