Ok, so this is the bass line from Louise; it's pretty easy but the speed can catch you 
out sometimes.

NOTE: Tuning in drop D!!

Verse:
G|-------------------------------------------------------------------------|
D|o-----0-0------------0-0-----------0-0-----------0-0---------------------|
A|o---------2-0------------2-0-----------2-0-----------2-0-----------------|
D|--0------------4-2-0---------4-2-0---------4-2-0---------4-2-0-----------|
   _________________  _________________
  |1.                |2,3.
G|-------------------------------------|
D|--0-0-------0--------0-0-------0-----|
A|------2-0-2--------------2-0-2---2---|
D|-------------------------------------|

Chorus:
G|-------------------------------------------------------------------------|
D|-------------------------------------------------------0---0-0---0---0-0-|
A|--2-2---2-2----2-2---2-2---------------------------0---------------------|
D|------4------4-----4-----4---5-5-0-5-5-0-5-5-0-5-5---4---4-----4---4-----|

G|-------------------------------------------------------------------------|
D|0----0------0------------------------------------------------------------|
A|--------------0-0--------------------------------------------------------|
D|---6---6-6---------------------------------------------------------------|

That simple.