Riff

E|-------------------------------------------------------------------| 
B|-------------------------------------------------------------------| 
G|----------------------------------------------0--------------------| 
D|-------0-------------------------------0--------2------------------| 
A|---0-2----0--2---------------------0-2----2------------------------| 
E|-----------------0--0-0--0-0--0-0-------------------0-0--0-0--0-0--| 

Repeat a bunch of times with slight variations, then

Continues after the ad
E|-----------------7-------7---------13-(b| end at same time)-15-------| 
B|------10-(b| end)-----10---------------------------------------------| 
G|-------------------------------------------------------------------|   
D|-------------------------------------------------------------------|   
A|-------------------------------------------------------------------|   
E|-------------------------------------------------------------------|   

E|----15-13-----------------------------------5-0-0------------------|   
B|-----------15----------8-(b| end)-5-8-5---5-8-------0----------------| 
G|----------------------------------------------------22222----------|   
D|---------------------------------------------------------22--------|   
A|----------------------------------------------------------22-------|   
E|-----------------------------------------------------------0-------|   

E|-------------------------------------------------------------------| 
B|-------------------------------------------------------------------| 
G|-------------------------------------------------------------------| 
D|------0------------------------------------------------------------| 
A|--0-2---0-2--------------------------------------------------------| 
E|------------0--0-0---0-0-------------------------------------------|