Am Riff
========                                   
E|--------0---------|
B|-----1-----1------|
G|-----2-------2----|
D|------------------|
A|--0---------------|
E|------------------|

Transition on the low E string play 2-4 or 4-2 depending (i think)


E7 Riff
========
E|--------0---------|
B|-----0-----0------|
G|-----1-------1----|
D|------------------|
A|------------------|
E|---0--------------|


INTRO
=========
AmRiff x4
E7Riff x4
Repeat three times

Then yer acoustic joins in to accompany the lead guitar, which plays
just Am and E7 all through verses
Chorus is G then E7 then E
Lead plays same chords but picks at the strings highlighted above
rather than strumming (obviously)