Band website: http://www.downsyde.com.au/

You need a slide for this. This is the main riff 
used throughout the song. NOTE THIS HAS A FUNNY TUNING. 
You only need to tune the G string (lel) down to an F to 
get that dual string slide sound. It's not 100% correct 
but it's pretty close


MAIN RIFF:

e:------------10/12-----------------------------8/10---|
B:--------------------10/12----------------------------|
F:----------------------------10/12--------------------|
D:----------------------------10/12-----10/12----------|
A:-----------------------------------------------------|
E:---10/12---------------------------------------------|

e:-------------------10/12-----------------------------|
B:-----------10/12----------10/12----------------------|
F:---------------------------------------10/12---------|
D:----------------------------------10-----------12----|
A:-----------------------------------------------------|
E:---10/12---------------------------------------------|

You can play around with these notes to try and get the other variations
but this is the main one, eg:

e:----------------------------------------------8/10---|
B:-----------------------------------------------------|
F:-----------------------------------------------------|
D:------------------------------8/10---10/12-----------|
A:-------------12/14---12/14---------------------------|
E:---10/12---------------------------------------------|