There are many Americas. Nowadays they barely speak to each other. But during the most perilous years of the last century, one young composer went in search of a sound that melded many of the nation's strains into something singular and new. He was a man of the left, though of no political party: gay, but neither closeted nor out; Jewish, but agnostic, unless you count music as a religion. This independence day (or near enough!), we revisit Sara Fishko's 2017 piece on the story of Aaron Copland.