I found this song free on iTunes, it's got a nice bass line. these are the different 
patterns played throughout the song. you can listen to the original and piece in where to 
play which part. hope it makes sense, have fun!

G:------------------------------------------------|
D:--------0?0---------2?2?0---------0?0--------2--|
A:-0--0---------2--2---------2?0?0-------2?2------|
E:------------------------------------------------|

G:-------------------------------------|
D:--------0?0-----------2?2------------|
A:-0--0-----------2---2----------------|
E:-------------------------------------|

G:-------------------------------|
D:--------0?0-----------3/4?3/4--|
A:-0--0---------2---2------------|
E:-------------------------------|

G:---------------------------------------|
D:------------0-0-0-0------------2-2-2-2-|
A:-0-0-0-0------------2-2-2-2------------|
E:---------------------------------------|

G:---------4-7-2?2-4-2----------4-7--0--0--2--2--------------|
D:-0?0---------------------4?4---------------------0-0-0-0-0-|
A:-----------------------------------------------------------|
E:-----------------------------------------------------------|