Gnarls Barkley--a collaboration between hip-hop/soul crooner and Goodie Mob founder Cee-Lo and DJ/mash-up kingpin Danger Mouse--sounds like it came from another planet; or what inhabitants of another planet might make of the elemental sounds of 21st-century pop music. Classically soulful R&B vocals, smart hip-hop/electronica beats and samples, and infectious hit-making melodies all serve to make the basic musical template familiar enough, but even a passing listen to the first single, ""Crazy"" (an Al Green-meets-Outkast groover that was a pre-release smash in the U.K. via downloads alone), illustrates that these fellas are definitely traveling some alternate spaceways.