On January 13, 1968, Johnny Cash recorded the iconic album "At Folsom Prison." The idea of the sinner saved by grace, the Man in Black, playing to a group of convicts is perfect on so many levels.
The story behind the concert speaks to Cash's desire to reflect his Christian beliefs, despite his failure to hold to resist the temptations of the road. Cash fell and rose and fell and rose throughout his life, and this enabled him to empathize with the prisoners.
This review, from 10 years ago, tells some of the stories behind the making of the album, as well as providing a nice "40 years later" perspective. Many of the observations still hold true, now 50 years later.