E|------------|
B|---0--------|
G|---0--------|
D|---2--------|
A|---2--------|
E|------------|

Riff 2 (verse): 
E|--------------------------------------------------------------------|
B|--0---0>>>3----3----3---2----2----1----1-----1| {3----0---------------|
G|--------------------------------------------------------------------|
D|--------------------------------------------------------------------|
A|--------------------------------------------------------------------|
E|--------------------------------------------------------------------|
       *-fool around with the open Eb on the 1 string a little

Riff 3 (verse): 
E|--------------------------------------------------------------------|
B|--------------------------------------------------------------------|
G|--------------------------------------------------------------------|
D|--------2--2>>>4-----------2----------------------------------------|
A|--5---------------------5-----------2-------------------------------|
E|--------------------------------------------------------------------|
     = at this time, the same riff is simultaneously being played
       2 octaves higher

Riff 4 (pre-chorus): 
E|---------------------------------------------------------------------|
B|---------------------------------------------------------------------|
G|--5-------------3---------3--------------------------------------2---|
D|--5-----2--3---4^ha| lf----4^half---4{5-----2---------2-----2----------|
A|--3---------------------------------------3-------3| {4---------0------|
E|---------------------------------------------------------------------|