For years, big-name directors have struggled to make a movie about the late reggae legend Bob Marley. Now, a new documentary aims to tell the story behind the superstar. Today: Bob Marley’s eldest son, Ziggy Marley and filmmaker Kevin Macdonald tell us about "Marley." Plus, a live performance from fast-playing Minnesota bluegrass band, Trampled By Turtles. And, our weekly Pick Three.