This is just a version I made up on the spot. I don't think it's correct but it contains the basic idea. Here's the tab for those who have been asking for it.
Intro:
| G Am G/B C
|-----------------------------------------------------------|
|-3--p0---------1------1------3------3------3------3--------|
|-0-----2-p0---------0--------0----0--------0----0----------|
|-------0----0-----2-----2-------0-----0-------0-----0------|
|---------------0-------------2-------------3---------------|
|-3---------------------------------------------------------|
^-----------> ^-----------> ^-----------> ^------------>
*** Update: Some people were having issues with this tab:
I couldn't find the correct notation for this, so I'm making
it up. You need to hold each of these root notes for
the duration of the chord. For instance, the first note
should be held down with your middle finger on the third fret
of the E string while playing the next notes up to Am with
your free fingers. Essentially, all the notes have to ring
for as long as possible. It's a bit hard if you're not very
comfortable finger picking. If you find it doesn't work, try
plucking strings of the chords below and you should get the
same feel.
Verse:
| G Am G/B C
|-3-------------3-------------3-------------3---------------|
|-3-------------1-------------3-------------3---------------|
|-0-------------0-------------0-------------0---------------|
|-0-------------2-------------0-------------2---------------|
|---------------0-------------2-------------3---------------|
|-3---------------------------------------------------------|
Chorus:
| G C G C
|-3-------------3-------------3-------------3---------------|
|-3-------------3-------------3-------------3---------------|
|-0---------------------------0-------------0---------------|
|-0-------------2-------------0-------------2---------------|
|-2-------------3-------------2-------------3---------------|
|-3---------------------------3-----------------------------|