linguistic:translation, structural:summarization
Folsom and other prison concerts

In the late 1950s Cash began performing concerts at prisons. He played his first notable prison concert on January 1, 1958, at San Quentin State Prison in California. These performances were recorded live, and released on highly successful albums: Johnny Cash at Folsom Prison (1968) and Johnny Cash at San Quentin (1969). Both live albums reached number one on Billboard country album music and the latter crossed over to reach the top of the Billboard pop album chart. In 1969, Cash became an international hit when he eclipsed even The Beatles by selling 6.5 million albums. In comparison, the prison concerts were much more successful than his later live albums such as Strawberry Cake recorded in London and Live at Madison Square Garden, which peaked at numbers 33 and 39 on the album charts, respectively.

The Folsom Prison record was introduced by a rendition of his "Folsom Prison Blues", while the San Quentin record included the crossover hit single " A Boy Named Sue ", a Shel Silverstein novelty song that reached number one on the country charts and number two on the U.S. top-10 pop charts.

In 1972 Cash performed at the Österåker Prison in Sweden. The live album På Österåker (At Österåker) was released in 1973. "San Quentin" was recorded with Cash replacing "San Quentin" with "Österåker". In 1976, a concert at Tennessee State Prison was videotaped for TV broadcast. It was posthumously released after Cash's death as a CD entitled A Concert Behind Prison Walls.