Riff 1:  1st half                       2nd half
E|--------------------------------------------------------------|
B|--------------------------------------------------------------|
G|--------------------------------------------------------------|
D|---44444444------------------------44444444-------------------|
A|-4-22222222----------77-44-55----7-22222222-----------77-44-55|
E|-5----------x's| 7----55-22-33----5----------x's 3-----55-22-33

Riff 2:
E|------------------------------------------------------------|
B|------------------------------------------------------------|
G|------------------------------------------------------------|
D|-----------------------77777777----------77-----------------|
A|-777777-55-7777777-----55555555-77777777-55-77-555555-777777|
E|-555555-33-5555555--------------55555555----55-333333-555555| x's 4

Riff 1: second half x's 2

Riff 2 x's 4

Riff 1: second half x's 2

Riff 2 x's 6

Riff 3:
E|----------------------|
B|----------------------|
G|----------------------|
D|---4444444-----------4|
A|-7-2222222| x's 4--7--2
E|-5----------------5---|