The whole song is just an Am (A minor Open) and an E Major open, and a C major.
1-0-------   1-0-----    1-0------|
2-1-------   2-0-----    2-1------|
3-2-------   3-1-----    3-0------|
4-2-------   4-2-----    4-2------|
5-0-------   5-2-----    5-3------|
6-xxxxxxxx   6-0-----    6-xxxxxxx
   Am (x02210@1)       Emajor (022100@1)     Cmajor (x32010@1)