A true trailblazer of New York hip-hop, LL Cool J plays this KO punch of a bill at Roseland in support of his new album, Authentic, which features Brad Paisley (yes, really), Eddie Van Halen (yes, really really), Snoop Dogg and Bootsy Collins. He's joined by raucous rabble-rousing rap veterans Public Enemy and mighty N.W.A. founding member Ice Cube. Mama said knock you out? We'll say.