Live did a cover of this song and put it on their greatest hits album.
Its basically the same as the original by Cash except all chords become minor.

Intro - Am

Am       Em                           Am
I keep a close watch on this heart of mine
Am        Em                     Am
I keep my eyes wide open all the time
Am         Dm                        Am
I keep the ends out for the tie that binds
Am             Em               Am
Because you're mine, I walk the line

Am        Em                    Am
I find it very, very easy to be true
Am     Em                          Am
I find myself alone when each days through
Am          Dm                      Am
Yes, I'll admit that I'm a fool for you
Am             Em               Am
Because you're mine, I walk the line

Am         Em                       Am
As sure as night is dark and day is light
Am         Em                      Am
I keep you on my mind both day and night
Am        Dm                              Am
And happiness I've known proves that it's right
Am             Em               Am
Because you're mine, I walk the line

Solo

Am           Em                     Am
You've got a way to keep me on your side
Am          Em                          Am
You give me cause for love that I can't hide
Am        Dm                            Am
For you I know I'd even try to turn the tide
Am             Em               Am
Because you're mine, I walk the line

Am       Em                           Am
I keep a close watch on this heart of mine
Am        Em                     Am
I keep my eyes wide open all the time
Am         Dm                        Am
I keep the ends out for the tie that binds
Am             Em               Am
Because you're mine, I walk the line x3

Solo