Efterklang, Tonight at the Apple Store in SoHo I had the great fortune this weekend of seeing the Danish band Efterklang perform at the Metropolitan Museum of Art. The band (whose name means "reverberation" or something close to it in Danish) performed with an orchestra, backup singers and a horn section. To reach the theater where the concert was held, you had to meander through the Egyptian exhibit: past ornate sarcophaguses and hieroglyphic friezes. I'd never been to any kind of presentation in a museum, particularly on a Saturday night. I kind of half-expected some crank in the audience (all seated reverently) to rise and declaim his apocalyptic visions, as in "The DaVinci Code" or "12 Monkeys." That didn't happen, quite. But for an encore, the singer, Caspar Clausen, exhorted the crowd to stand and groove for at least a few minutes. The crowd obliged. The band's orchestral tour is over for now, but Efterklang will perform tonight at 7 p.m. at the Apple Store, in SoHo, to promote its new album, "Piramida." Here's a video from a concert in Sydney to give a sense of what they do.