Terri Clark interviews Mark Collie about his latest album "Book Of My Blues."  Mark describes it as a concept album.  He says it comes from a graphic novel he's working on called "The Rockabilly Hitman."  Mark co-wrote the title song of the album with Billy Bob Thornton, and they've been friends for a very long time.  Mark has a song on a new movie soundtrack called "The Ice Road."  Mark also talks about a lot of the friends he's made during his career, from Johnny Cash and Merle Haggard to Tim McGraw and Brooks & Dunn.  See omnystudio.com/listener for privacy information.