Laurent Dubois never felt like a true American until he started playing the banjo. His fascination with the origins of the instrument led him on a search to discover its roots and the ways it evolved from an African and Caribbean instrument to its present iteration. Host Frank Stasio talks with Dubois about his new book, “The Banjo: Africa's American Instrument” (Harvard University Press/2016). He also talks with musician Joe Newberry who plays live.