Play in Dropped-D tuning.
Unless the mp3 I got was slow, you will also need to detune your
guitar a half-step before tuning to Dropped-D.
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This pattern just repeats throughout the intro:
E--------------------------------------|
B------3-3--------------3-3------------|
G------2-2--------------2-2------------|
D------0-0-3b-0--0------0-0------------|
A--0-0---------3b---0-0-----3b-0-------|
D--0-0--------------0-0---------3b-0---|