My impression is that sad music tends to have more substance than happy music. Happy pop music is especially guilty of this where: "it's the summer, everyone is having a good time etc..."

I'm really drawn to metal because it creates something beautiful out of difficult emotions. I actually don't get the association to anger at all, it's like saying people who like watching action movies are psychopaths.

I would argue that more art is rooted in pain than in happiness.