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