In Johnny Cash's defense, the song is a very standard 12 bar blues progression (I I IV I V), which Johnny and every other blues artist uses liberally. He's obv

In Johnny Cash's defense, the song is a very standard 12 bar blues progression (I I IV I V), which Johnny and every other blues artist uses liberally. He's obviously ripped off every other aspect of the song (lyrics, rhythm, feel). Everything but the key change.