intro
for the intro it sounds like omar recorded one riff and cut it up and out into two 
separate stereo tracks to make it sound like two different riffs. this may not be exact but 
its in the same key and it sounds good if you play it with short delay and alternate picking

e|-------------|
b|---------4---|
g|-----0-3---0-|
d|-3-6---------|
a|-------------|
e|-------------|

e|-------------|
b|---------4---|
g|---3-0-3---0-|
d|-1-----------|
a|-------------|
e|-------------|

e|-------------|
b|---------4---|
g|-----0-3-----|
d|---3---------|
a|-1-----------|
e|-------------|


chorus
Predicar, Tu rostro me recordara..
e|-------------------------------------------------------|
b|-8---9---11----9----8----------------------------------|
g|--8---8----8----8--------8-----10----12-----10----8----|
d|---10--10---10---10---10---1010--1010--1010---1010--10-|
a|-------------------------------------------------------|
e|-------------------------------------------------------|

then back to the intro riff

break (the alternate time signature part)
"Yo soy la voz"
e|------------|
b|------------|
g|------------|
d|------------|
a|------------|
e|-1-11-44-33-|

bridge
"No me des confianza"
e|--------------------------------|
b|--------------------------------|
g|--------------------------------|
d|-3--------------3-----------1-2-|
a|------1-2--1---------1-2--3-----|
e|---4--------4-1---4-------------|

back to the break

then bridge

and finally the vocal melody part
"Tus labios sin mi"
this isn't what omar plays but it fits nicely if you tremolo pick with delay at ~800ms
e|-----------------|
b|-13---12--9-8--6-|
g|-----------------|
d|-----------------|
a|-----------------|
e|-----------------|