No doubt, Gwen Stefani is one of the baddest frontwomen of alt-rock, and as a soloist, her star shines just as bright. On this set of genre-hopping jams, she displays her pop versatility in the ‘80s freestyle of “Crash” and in the slacker ska-punk of “Saw Red.” Stefani goes for a minimal percussive venture on “Yummy,” and on “Spark the Fire,” SoCal’s original punk-pop firecracker assures us she’s still commanding the dance floor.