The FBI investigated composer Aaron Copland for 20 years. Yes he was political, but he has also, for decades, been considered one of America’s most recognizeable musical voices. “The extent of Copland’s political engagement is neither a secret nor a surprise. Copland never hid his essential political sympathies. But what these documents tell about the US treatment of Copland is as much the story of the harassment of 20th-century composers as anything that happened to Dmitri Shostakovich in the Soviet Union or to Kurt Weill or Ernst Krenek in Nazi Germany. “