there is a riff played by a piano for the whole song it is: 
Riff1:  (There is more muting between strums as the song develops, listen to it to confirm) 
----------------| 
----------------| 
---9-9---x--7-7-| 
---9-9---x--7-7-| 
---7-7---x--5-5-| 
----------------| 
Riff2 
----------------| 
----------------| 
--4--4----------| 
--4--4---hold---| 
--2--2----------| 
----------------| 
Riff3 
----------------| 
----------------| 
-4-4--------2-2-| 
-4-4--------2-2-| 
-2-2--------2-2-| 
----------------| 
END