Major Milestone for Johnny Cash’s Signature Hit Song [VIDEO]

It was July 20, 1968 when the live version of "Folsom Prison Blues" hit the top of the country music charts.

The Johnny Cash standard is considered by many to be Cash's signature song. One of country music's true "outlaws," Cash was able to convey the emotion of the song as if he was singing to a group of brothers, rather than fans and strangers.