Intro/chorus:
e---0-----------1--------------
B-----1-------------3----------
G-------2----------------------
D------------------------------
A--3---------0-----------------
E------------------------------

The random violin/cello hits in the beginning (0:04) are just a couple of fast G power chords.

Also instead of playing an open A, you could play the 3rd fret on the D string. It sounds nicer in my opinion.