I am probably going to give my age away with this reply, but I have never been into mainstream music really. I like a lot of the older metal like slayer, metalica, wasp, venom and those types of bands. But my likes spread across a wide variety of genres, others include cradle of filth, pixies, white zombie and love & rockets.
There are so many more that I could also mention, but I guess you all get the picture by now. Music is a very personal thing to me and so long as there is decent instrument playing and the words have meaning, then it is all good.