This is the acoustic version of the song, it's totally different from the normal one... 
it's cute.

Intro: (This is a sort of a general tab for the intro)
    C       Am       F       G
e|----------------------------------|
b|-----1-------1p------1-------3----|
g|---0---0---2---0----2-2----0---0--|
d|----------------------------------|
a|--3--3----0--0--------------------|
E|------------------1--1----3--3----|

e|-------------------------------------|
b|-----3-1-----1p------1-------3-/5----|
g|---0-------2---0----2-2----0---------|
d|-------------------------------------|
a|--3--3----0--0-----------------------|
E|------------------1--1----3--3-------|
After sliding to 5 go back quickly to the C chord and so on...

Keep going with the same chords with a few variatons, listen for it... but basically the 
song is C, Am, F, and G

Tabbed by Luciana Echarren
Aguante Argentina vieja!