Basic riff just two notes (slightly altered during guitar solo)
You have to listen to the song to get the timing right

G |---------------------------|
D |---------------------------|
A |---------------------------|
E |---7--7-7p5p7--7p5-5p7-7---|


Interlude 
G |---9---9---9-----------------|
D |----------------5------7-----|
A |---7---7---7-----------------|
E |--------------3---3--5---5---|