One of the riffs is just doing a lot of 3's on the E
string,like below. The timing is something like
16th notes.

G|--------------------------------------------------------|
D|--------------------------------------------------------|
A|--------------------------------------------------------|
E|-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3------------|


Another riff in there is this, the main one....

G|----------------------------|
D|------------------------1---|
A|----------------------1---3-|
E|-3-3-3-3-3-3-3-3----3-------|



The last riff is this, used in the chorus,
"green hell, green hell" part.

G|---------------------------------|
D|---------------------------------|
A|---------------------------------|
E|-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-|


G|---------------------------------|
D|---------------------------------|
A|---------------------------------|
E|-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-|



After one of the chorus's (either the 1st or 2nd time,
I'm not sure), there is a little fill that goes
something like the little riff below.

G|--------------------|
D|------7-------------|
A|-5-7----7-5--------|
E|--------------7-6-5-|