WASHINGTON – Aman Feda, an Afghan-born mortgage broker, cringed at his 13-year-old niece’s choice of music, the hip-hop blaring from the car radio, the lyrics grating on his nerves as they drove home after shopping at a mall. “Why not listen to some Afghan music?” Feda asked casually. “What music?” he remembers her saying with a shrug of her shoulders. “There’s nothing.” The exchange sparked Feda...