Tuning: Drop D tuning, down 1 step. C,G,C,F,A,D 
This might not be the actual tuning they use but it works. This is only the beginning but it's a start. 
 
C|------------------------------------------------| 
G|------------------------------------------------| 
C|-10------13--12--13--10------13--12--13--9------| 
 P.M..............................................| 
 Tremolo pick each note.    
   
C|------------------------------------------------| 
G|------------------------------------------------| 
C|-13--12--13--9------10--12--13--12--------------| 
 P.M..............................................| 
 Tremolo pick each note except the last four. 
 
Play 2X