This is an awesome song from the movie "127 Hours".
The intro is very simple and all you have to do is repeat the following sequence below.
Spin your "Tone" down to 0 if you for example have a Fender Stratocaster like I do, and 
have fun!

And just to let you know, this is my first tab.
I don't know if this is correct, but there wasn't anything out there for this song yet, 
and it sounds good enough for me.
If you make out anyting else for this song, good for you!

The intro lasts from 0:00 - 0:17, as Dido starts singing.
You can in fact play this sequence throghout the song, if you want.

Guitar I
e |--------------------------------------------------------------------|
B |--------------------------------------------------------------------|
G |--------------------------------------------------------------------|
D |--------------------------------------------------------------------|
A |------10s15-12----5s10-10-------------------------------------------|
E |--------------------------------------------------------------------|
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