Em7  0 2 2 0 3 0 
A7   x 0 2 0 2 0 


Occasionally this A7 makes an appearance: x 0 2 0 2 3 

Here's the picking for the intro: 

   Em7                               A7 
E|---------0-----------0-----------|---------0--------------0-----0--|
B|-----------3-----3~-----3------3-|-----------2--------------2------|
G|-------0-----0-------------0-----|-------0-----0--------0-----0----|
D|-----2-----------------------2---|-----2--------------2------------|
A|---------------------------------|-0---------------0---------------|
E|-0-------------------------------|---------------------------------|