For the uninitiated, Sam Bush was a founding member of the band New Grass Revival, and as the name of this 70s outfit would suggest, this mandolin player and his cohorts including Bela Fleck, brought forth the progressive sounds of bluegrass that several of the newer bands are playing today. So it was quite a delight when a publicist sent me a streaming copy of Revival: The Sam Bush story. I knew many of the stories, but like most great documentaries, you always learn something new. The film, has been out on Amazon Prime now for a couple of weeks, and I’d encourage you to watch it, but first, have a listen to our conversation with Sam. The conversation started when I asked Sam how this film came about…