What At Folsom Prison did was change the context in which Cash was perceived. Before the album, he was understood primarily as a country artist with a checkered recent past — someone whose early records were important but whose current work was inconsistent. After the album, he was understood as something harder to categorize: a performer with a specific kind of authority, a voice that carried the weight of experience in a way that Nashville’s mainstream stars did not, an artist whose connection to the margins of American life was not a marketing position but an apparent fact.
The television show and the subsequent San Quentin album extended this repositioning. Cash became, in the late 1960s and early 1970s, one of the few country artists who could plausibly be discussed alongside the figures of the singer-songwriter era — Bob Dylan, Joan Baez, Kris Kristofferson — without seeming out of place. His friendship with Dylan, documented in the duet “Girl from the North Country” on Dylan’s Nashville Skyline album (also produced by Johnston, also from 1969), signaled an alignment that would not have seemed plausible a few years earlier.
This repositioning was partly a consequence of the album and partly a consequence of the year in which it appeared. 1968 was the year of the Tet Offensive and the King and Kennedy assassinations, the year that the civil rights coalition fractured and the antiwar movement grew enormous and the Democratic Party came apart at its convention in Chicago. The smooth optimism of mainstream Nashville pop was not what many listeners were looking for in that moment. At Folsom Prison — raw, unpolished, performed in a maximum-security prison for men who were beyond the reach of the normal civic conversation — was a record that seemed to come from somewhere real.