Eminem's "Mosh"
Watch video here
Yeah, he's a little late to the game, but it is nice to see him use his fame to speak out. I have mixed feelings out Em, but I do like him better when he's "Eminem" rather than playing "Slim Shady" or going after pop stars.
His most compelling work has always been when he puts on his (semi) serious hat - "Way I Am", "Lose Yourself", "White America" and now "Mosh".