starts in with a little bit of palm muting on E chord up on the 7th fret of the a string
E|-----------------| ----------------------------------------------|
B|-----------------| ---------------------7h8----------------------|
G|-9-9-9-9-9-9-9-9-| -9--7----7--6--4--7-------9-------------------|
D|-9-9-9-9-9-9-9-9-| -9--7----7--6--4--7---------------------------|
A|-7-7-7-7-7-7-7-7-| -7--5----5--4--2--4---------------------------|
E|-----------------| ----------------------------------------------| pm...............


after that u repeat it but with out the palm mutes


then it goes in the main beat of the whole song which is

riff 1                     Riff 2
E|------------------| e---------------------|
B|-22222--2222------| B-22222-2222----------|
G|-22222--22224p2p0| x2     G-22222-2222----------| x3
D|-22222--2222------| D-22222-2222-----0-2--|
A|-00000--0000------| A-00000-0000-0-3------|
E|------------------| E---------------------|


on the third time of riff 2 ray starts singing and then it will switch to

riff 3

E|-22222-2222---------------| Then u go back to riff 2 you'll hear it
B|-33333-3333---------------|
G|-22222-2222-----0-2-------| x1
D|-00000-0000-0-2-----------|
A|--------------------------|
E|--------------------------|

then the chorus comes in and it's a little different but pretty much same stuff

you'll play A chord but not the riff and then when u hear the switch u play riff
3 twice then u play A chord and then hit a single D
so it goes

A/A/A/A   A/A/A/D ,riff 3 X2 ,A/A/A/A   A/A/A/D ,then riff 3 X1

Then the last time he does a little riff

E|---------------------|
B|---------------------|
G|-777-7b-7p5----------|
D|-777--------7-5------|
A|-555-----------------|
E|---------------------|