Riff 1 (intro)
G----------------------------------
D-5--5-2-----------2---------------  x3
A--------5--5-2-3----5--5-5-5------
E----------------------------------

G----------------------------------
D-5--5-2---------------------------
A--------5--5-3-2------------------
E----------------------------------

Riff 2
G----------------------------------
D----------------------------------  x6
A-0222022202225353-----------------
E----------------------------------

Riff 3
G----------------------------------
D----------------------------------
A-55555555333333335555555533333333-
E----------------------------------

riff 2 x4?
riff 3
riff 2 x?

I'm not sure about riff 3 but the rest is right. I've tried to tab out
the rhythm but it maybe wrong. (-55-) these are 16ths
                               (-5-5-) these are 8ths
                               (-5--5-) these are 4ths