Opening riff:
E|--------------------------------------------------------------
B|--------------------------------------------------------------
G|--------------------------------------------------------------
D|--------------555------------------------------------------
A|----7--5--7---------7--------------------------------------
E|-0----------------------------------------------------------- 

The variations:

E|--------------------------------------------------------------------------
B|--------------------------------------------------------------------------
G|--------------------------------------------------------------------------
D|------------------5--------------------------------------5--7--5-------
A|-----7--5--7---------7--5--7--------------7--5--7---------------7--
E|-0---------------------------------------0------------------------------- 

E|-----------------------------------------------------------------------------------
B|-----------------------------------------------------------------------------------
G|-----------------------------------------------------------------------------------
D|------------------6(bend 1/2 step up)66-------------------------555-----
A|-----7--5--7------------------------------------------------7--5--7------------
E|-0--------------------------------------------------------0----------------------- 

E|----------------------------------
B|----------------------------------
G|----------------------------------
D|----------------------------------
A|----------------------------------
E|-0--0--3--0--3--0--3--5----- 

The bridge:

E|-------------------------------------------------------------------------
B|-------------------------------------------------------------------------
G|-------------------------------------------------------------------------
D|-----------------------------------------------2------------------------
A|-----------------3--3--3--5------5--5--5---------0--0--0--2------
E|--3--3--5-------------------------------------------------------------- 

Repeat at a faster tempo and add: 

E|--------------------------------------------------------------------------
B|--------------------------------------------------------------------------
G|--------------------0--0--0--2-------2--2--2--4---------------------
D|-0--0--0--2----------------------------------------------2--2--2--4-
A|--------------------------------------------------------------------------
E|-------------------------------------------------------------------------- 

E|------------------------------------------------------------------------------
B|------------------------------------------------------------------------------
G|---------------------0--0--0--2-------2--2--2--4------------------------
D|-0--0--0--2----------------------------------------------2--2--2--4-----
A|---------------------------------------------------------------------------2-
E|------------------------------------------------------------------------------ 

E|-----------------------------------------------------------------------------
B|-----------------------------------------------------------------------------
G|-----------------------------------------------------------------------------
D|-0-----0--2--0------------------------------------------------------------
A|----2-------------2--0-----------------------------------------------------
E|---------------------------3--0---------------------------------------------