I can relate to pop music just fine but those tunes are shallow compared to the information packed songs from Radiohead. But I've never loved Radiohead for their melancholy. Only for their outstanding musical abilities. They also seem to be bright, clever, intelligent even, judging from their lyrics and interviews. I don't consider them dark. I consider them bright.
I've been depressed tons of times. I'm bipolar, they tell me. But even outside of a depressive state I return to those artists that try a little harder than those who aim for the top lists.
I think most other people who are depressive by nature, when they feel good about themselves they shy away from things that remind them of themselves in a depressive state. But I love being depressed. It's a much better feeling than being manic.