On A Sectioned Beam, the EP follow-up to last spring's The Incomplete Triangle, Lansing-Dreiden check their overbaked art-school pretensions at the recording-studio door and deliver a heady mix built around ambitious Pet Sounds-style orchestrations. ''Spectrum of Vapor'' revels in delicate chamber-pop melodies, while ''A Sectioned Beam'' is a bouncy dose of new wave. One false note: bonus cut ''The First Response,'' when leaden percussion and twee faux British vocals take over.

