Here's the little keyboard riff that plays throughout the song.  It sounds best if you 
up the low end on your amp and pluck the string like you would a bass.

e---------5-55-9-7-5---5-77-79-7-55---|
B--55-555------------7-------------7--|
G-------------------------------------|
D-------------------------------------|
A-------------------------------------|
E-------------------------------------|

Yup.  It's that simple.