Flip through the slideshow below for 18 essential tracks for any outlaw country playlist, from classics like Cash's "Folsom Prison Blues" to deeper cuts from Billy Joe Shaver and Jerry Jeff Walker.

Whether or not you were there to hear these classic tunes in person, there's no denying the enduring appeal of country music from the 1960s. Merle Haggard, Patsy Cline, and George Jones dominated ...