On the sequel to his critically beloved 2007 debut, Swedish producer Axel Willner arranges unrecognizable samples into elegant dance music that's fit to be played at a velvet-rope club located inside a cloud. Willner's skills are apparent on "Leave It," where ghostly atmospherics combine with a cold-steel pulse for a groove both hypnotic and lighter than air. But after a few listens, the charm of many of Willner's soundscapes fades: They provide a certain Vicodin-buzz pleasure — and then...