Overview: The performer continues his mission to understand how music works by exploring its extraordinary power to tell stories. His journey includes meetings with film director Francis Ford Coppola, who explains how simple musical devices transformed the most famous scenes in The Godfather and Apocalypse Now, Sting, who describes the secrets of his song-writing process, rapper Talib Kweli, who looks at the power of music in protest, and the French-Cuban Ibeyi sisters, who show how music has kept the Yoruban tradition alive.