Copenhagen's Efterklang often swell to ten players to better wow audiences with their earthshaking live shows. As with Sigur Rós and Rachel's, this orchestral- pop group is clearly indebted to neo-classical composers like Steve Reich and Philip Glass. But it sets itself apart with a heavy reliance on the human voice, whether in the form of a swelling chorus or the haunted lament of a single singer. Openers and fellow Danes Slaraffenland offer a mix of wiry guitars, cool electronics, and soulful vocals more reminiscent of TV on the Radio.