Best Of: Rob Reiner On 'Spinal Tap II' / Billy Strings
Rob Reiner talks with Terry Gross about directing the new sequel to Spinal Tap, the mockumentary about a heavy metal band.  He'll  also talk about his remarkable life and career, like directing When Harry Met Sally and starring in All in the Family. Also, singer songwriter and guitarist Billy Strings is one of the rare bluegrass musicians who can fill arenas with tens of thousands of fans. He's been…