Reviewed in this essay: “Remembering September 11,” a concert by the Wordless Music Orchestra at the Metropolitan Museum of Art, New York, September 11, 2011. William Basinski’s epic four-disc masterwork The Disintegration Loops emerged in 2002 with two backstories. First, Basinski, a little-known classically trained composer, was digitizing analog tape loops of twenty-year-old recordings when…