Country Music

An interesting programme I enjoyed recently, was  on BBC 4, presented by Ken Burns and entitled Country Music: "a history of Country Music, from it's roots in ballads, hymns and the Blues." It's a subject I am really keen to follow up/ get into, so I'm looking for a starter to read; CD's or DVD's. Anyway it's a three part series, so I'm definitely looking forward to the rest of it.