main riff:
E|----------------2------|
B|----------------3------|
G|--11-12---------2------| repeat a lot
D|--------11-12---0------|
A|----------------0------|
E|----------------x------|

main riff alternative #1:
E|----------------2------|
B|--7-8-----------3------|
G|------6-7-------2------| repeat a lot
D|----------------0------|
A|----------------0------|
E|----------------x------|

main riff alternative #2:
E|--2-3-----------2------|
B|------2-3-------3------|
G|----------------2------| repeat a lot
D|----------------0------|
A|----------------0------|
E|----------------x------|

the other part of the song is SOMETHING like this...(the first two notes are played VERY quickly)
E|-----------|-----------------|
B|-----------|-----------------|
G|-16-16--14-|-16-16--17-17-17-|
D|-----------|-----------------|
A|-----------|-----------------|
E|-----------|-----------------|
  ^ 3 times ^  then ^

the other part has a second version which is higher like this (the first two notes are 
VERY quickly just like the first version)
E|-----------|-----------------|
B|-----------|-----------------|
G|-19-19--17-|-19-19--21-21-21-|
D|-----------|-----------------|
A|-----------|-----------------|
E|-----------|-----------------|
  ^ 3 times ^ then ^

end of the second version near end of song ends like this
E|-----------|-----------------|
B|-----------|----17-----17--20|
G|-19-19--17-|-19-----19-------|
D|-----------|-----------------|
A|-----------|-----------------|
E|-----------|-----------------|
  ^ 3 times ^ then ^