I think the reason it's kinda dead in there is because music is such a personal thing, especially on a forum where most of us care about it so much. Even though there are strict rules about being mean in there, still, it happens, and it's really sad when the only person who notices is the one who got hurt.
In my lurkings in the music forum I saw it in more threads than not - some person mentions a favorite band or song, and someone else comes along and says how bad it is. Maybe they say it in a nice way, maybe they don't, but the meaning is the same. Meanwhile, you just poopoo'd on someone's favorite song.
Maybe it's not the reason we say out loud that we don't go in there, but that's why. There's no solution to the problem because as I said, the rules are already strict, and a lot of times people doing the insulting don't even know they're being insulting. No, I'm not talking about me because I don't post enough in there, and I've voiced unpopular opinions about performers myself. It's just how people are, and if you love something and it's close to your heart and you don't want to see it poopoo'd on, you're not going to talk about it in a forum.