::::I disagree. A general genre shouldn't NEED a citation, because so many people agree with it. When have you seen a song by Slipknot that wasn't some type of metal (excluding "Snuff")? Perhaps you're taking this a little too far. There aren't going to be many dead-giveaway citations because they expect their readers to know that kind of stuff. Until we do find one, which may take a while, why don't we just leave it at Metal and from there just leave it alone?