Main riff (acoustic guitar):
--------------------------------------------------------------------------------
-----1------------------1------------------1------------------------------------
-0h2---2-0---0------0h2---2-0---0-2----0h2---2-0---0---2-2-0h2p0---0------------
-----------3---0--------------3------------------3---3-----------3---3----0-----
-----------------------------------------------------------------------3b-------
--------------------------------------------------------------------------------

Ending:
----------------------------------------------------------
---13b15-15r13---------------------------------13b15------
---------------12b14-14r12--10-12-10----------------------
-------------------------------------12-10-12-------------
----------------------------------------------------------
----------------------------------------------------------

versao 2

Tune your fat E string down to a D, then play an Fmaj7 type shape like this
0x3230 with your little finger on the 3rd fret on the b string then play this riff.

e---------------------------------------------------------------------------
b-----------------3--------------------------------------3------------------
g---------0h2---------2-0--------0-------------0h2----------2-0--------0-2--
d----------------------------3--------3------------------------------3------
a---------------------------------------------------------------------------
D|---0--------------------------------------0--------------------------------

e---------------------------------------------------------------------------
b-----------------3---------------------------------------------------------
g---------0h2---------2-0--------0---------0h2-2-0h2p0--------0-----0-------
d----------------------------3--------3--------------------3-----3------3---
a---------------------------------------------------------------------------
D|---0----------------------------------------------------------------------0