Crowell wrote this about how Johnny Cash's song "I Walk The Line" changed his life when he first heard it as a kid. He was married to Cash's daughter Rosanne from 1979-1992 and produced most of her early work.
Crowell got Cash to sing the chorus from "I Walk the Line" for the song.
Suggestion credit: Julian - Oakland, AR, for above 2
Eddie Vedder often changes the words when he sings "Yellow Ledbetter." The basic story is about a guy whose brother dies in the first Gulf War. Apparently, bad news in the army is given in yellow envelopes.
"Sloop John B" is a traditional West Indian folk song, and it was a huge hit for The Beach Boys in 1966. They tweaked the lyric, "This is the worst trip since I've been born" to "...I've ever been on" as a wink to acid culture.