This is the bit played at the beginning of the track.

Warren plays it on Violin (though he picks it as if it were a guitar/mandolin).
I worked it out on Mandolin, and it sounds very similar. Violin and Mandolin tuning are 
E-A-D-G. Have a go at playing on guitar, not sure how it sounds!

E|---------------------------------------------------------------|
A|---------------------------------------------------------------|
D|----10----12----14----12----10---------7-----------------------|
G|-----------------------------------------9---- --9------   X 1-|




E|---------------------------------------------------------------|
A|---------------------------------------------------------------|
D|----7----10----12----14----12----10---------7------------------|
G|---------------------------------------------9---------9-------|  X2




E|----------------------------------------------------------------------|
A|----------------------------------------------------------------------|
D|----------------------------------------------------------------------|
G|----9----12----14----12----14----12----14----9----14----9-------------| X1