Birdman’s stolid, workmanlike delivery is the perfect set-up for Wayne’s mischievous detours. About All That” blends James Brown with Black Sabbath, as Wayne proclaims himself “mashed potato smooth,” but it is the title track that really enlivens his imagination. When Birdman and Lil Wayne collaborate on the perfectly pitched sticky soul of “1st Key” or “Don’t Die” it's hard to imagine a more effective duo.