WTOP Entertainment Reporter Jason Fraley chats with Grammy-winning songwriter Marcus Hummon, who co-created the Frederick Douglass musical “American Prophet,” which makes its world premiere at Arena Stage in Washington D.C. now through Aug. 28. They spoke about his Nashville success writing “Cowboy Take Me Away” for The Chicks and “Bless the Broken Road” for Rascal Flatts. (Theme Music: Scott Buckley’s “Clarion”)