When laying the dialogue over background music, let's say it's a party scene. Are you concern with portraying the reality, by keeping the music throughout the dialogue, Or you faded it out as the conversation gets more intense...?

By the way, How do u eq the background music? Which frequency do you cut? I was watching the scene from Kids (http://www.youtube.com/watch?v=JcQhURrV900) They kept the background music quite loud, yet the dialougue is still very clear.