It just plays these three chords throughout the whole song

play all strings                          hit the bottom string but mute it
        Am (x02210@1)              C (x32010@1)                         G (320003@1)   |---0---------0---------------=------------
    |---1---------1---------------0------------
    |---2---------0---------------0------------
    |---2---------0---------------0------------
    |---0---------2---------------2------------
    |---0---------=---------------3------------
                   hit the top string
                       but mute it

Its played like this

Am (x02210@1)              C (x32010@1)                  Am (x02210@1)            G| (320003@1)||| |||||         || ||| |||||        | ||| |||||       || ||| |||||
and repeat