Curtis Jackson became a star by dropping riotous rhymes over club-friendly beats, but the darkest corners of his back catalog are full of gritty gangsta rap. He threatens to “put a hole” in his enemies so he can dodge a prison sentence on “Places to Go,” which is powered by the dangerous rumble of an electronic beat, while the dramatic squiggles of “Gotta Make It to Heaven” find him punishing the street soldiers who've been disloyal to him.