I'm not sure about the tuning but this is how I think the song goes:
 -------------------             
 --------------------                 
 --------------------
 ---12-11--9--8-7-

then it goes like this for a while:
--------------
--------------
--------------
-0-7-6-5---

then it goes:
----------------------------------------------------------------------
------------------------------------------------------------------------
-----------------------------------------------------------------------
--1-----1-0-------1------1-0-------1--------1-0------1--------1-0

the last part's a little harder:
-------------------------------------------------------------
--------------------------------------------------------------
--------------------------------------------------------------
---1--------X--------0-0-1-0--------1-------X-------0-0
and it does this till the end of the song