Different things I like to think, but at the core - probably prog, hard rock and a bit of metal. Examples are bands/artists like Gentle Giant, Yes, Frank Zappa, Deep Purple, Boston, Dio and Megadeth.
ruth, there is a potential problem with your study though
Asking here might be a good way to get answers, but what sort of people is it you want to ask? That might be something you wanna ask yourself before you start. The people here and their tastes my not reflect that of the general public in the area you come from. Our community makeup is not random either, it's mostly teenagers and people in their early 20s who are perhaps likely to be more explorative and diverse with our interest in music than the average person in your community.
I'm guessing it's not that important in your study (I guess you're not exactly doing science), but it's good to at least be aware of
