Main Riff 1 is always followed by Main riff 2 or a variation of 2. I've
tabbed three variations but you can mess around heaps giving the song
freedom.
The Riffs are guides. play around and enjoy.

Main Riff 1
E|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|---------------------------------------------------------------------------|
D|---------------------------------------------------------------------------|
A|---------------7-(p5)-7--5-------------------------------------------------|
E|-----0--------------------------0--5p3---5p3-------------------------------|

Main Riff 2
E|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|---------------------------------------------------------------------------|
D|---------------------5---7---5------------5--------------------------------|
A|--------7---5h7------------------5h7---------------------------------------|
E|----0----------------------------------------------------------------------|

Main Riff 2 Variation 1
E|-----0------------0--------------------------------------------------------|
B|---------0-3b5-----5r3--0--------------------------------------------------|
G|--------------------------------0--2b4-2b4--2b4--2br4-2p0------------------|
D|------------------------------------------------------------2--------------|
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|

Main Riff 2 Variation 2
E|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|---------------------------------------------------------------------------|
D|-------------------5-------------------------------------------------------|
A|------7---5h7---------7s5--------------------------------------------------|
E|---------------------------------7-----3-----------------------------------|

Key Change to A for Chorusy part
E|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|---------------0-----------------------------------------------------------|
D|-----------2-----2p0-------------------------------------------------------|
A|--0--00-----------------0--------------------------------------------------|
E|---------------------------------------------------------------------------|

Variation on A Riff
E|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|----------------0-------------0----------0-----------0---------------------|
D|------------2----------0h2------0h2-------0h2--------2p0-------------------|
A|--0--00-----------------------------------------------------------0--------|
E|------------------------------------------------------------------------3--|

Back to Main Riff 1&2 for a while, changes to A for chorus part
Variation 3 on Main Riff 2
E|---15b17---15p12-------12----12--------------------------------------------|
B|------------------15---15b17-------17r15p12--------------------------------|
G|----------------------------------------------14---------------------------|
D|---------------------------------------------------------------------------|
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|