When Nelly's at his madcap best, you never know what he'll say next—or how he'll say it. In these six songs, all hits from 2000 to 2005, the St. Louis rapper experiments with new flows and melodies in every verse. The hook-filled "Ride Wit Me" makes for a crossover jam that's both ebullient and a touch melancholy. "Grillz" is only the former, as Nelly and friends describe their dentures over plinking percussion and stinging strings.