classical sampler?

I'd like to find some classical music, but don't know where to start. Instead of picking a composer ( I guess that's the right word) based on someone's suggestion, I'd like to find a good sampler cd / SACD that will give me a range of composers so I can find out what suites me. I mainly listen to rock and roll. So the heavier classic music would probably fit me better as opposed to the light jazz style if you know what I'm saying. Any help would be appreciated.