This is a great song and band. I don't know what the second guitar is playing,
but this is the main riff.
Standard Tuning: EBGDAE
E|--------------------------0--1/3---------0-------------------------------|B|-5p3p0-----------0--1/3------------0--1-----1----------------------------|G|--------3--0h2-----------------------------------------------------------|D|-------------------------------------------------------------------------|A|-------------------------------------------------------------------------|E|-------------------------------------------------------------------------|
E|--3p0---3p0----0h1p0-------0----3p0--------------------------------------|B|------1-----1--------1---1---1-------1h3---------------------------------|G|-------------------------------------------------------------------------|D|-------------------------------------------------------------------------|A|-------------------------------------------------------------------------|E|-------------------------------------------------------------------------|
/ = slide up
\ = slide down
h = hammer on
p = pull off
b = bend
r = release
x = muted string
t = tap (with finger or pick)
~ = vibrato
