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 E major C major