The main riff he plays throughout the song just different parts of it, it kicks in after 
50 seconds, its the tune he plays on the irish guitar thing at the end of tinselworm

(this is my first tab i was desperate to know how to play it and couldnt find a tab so i 
obliged to do one when i found it out for myself)

----------------------------------------------------------------------------|
---3--33~~~~~~~~---3--3~~~~~~~~~3--3---------3--3-----------------------3---|
---2--22--55-4-2---2--2/7-7-5-4-2--2/7-7-5-4-2--2-----------------------2---|
---0---------------0------------0---------------------2/3-3-5-5-2-2-3---0---|
---0---------------0------------0---------------------0---0-0-0-0-0-0---0---|
----------------------------------------------------------------------------|

probably a bit rusty, youll just have to figure the rest out for yourself