Main Guitar Riff:
e|---------|
B|---------|
G|---------|
D|5-5-5-5p4|
A|5-5-5-5p4|
D|5-5-5-5p4|
 [PM. . .]
Dubstep:
e|---------------|
B|---------------|
G|---------------|
D|3-0-0-3-0-0-3-1|
A|3-0-0-3-0-0-3-1|
D|3-0-0-3-0-0-3-1|
 [PM. . . . . . ]
every now and then during dubstep:
e|-----|
B|-----|
G|-----|
D|-----|
A|-----|
D|1/15~|
That's it.