Tuning: Standard

Main Riff: (9/10ths of the song)
G|------------------|
D|----55---55-------|
A|-5h7--5h7--75--5--|
E|-------------7----|

Ending: (after Bradley says "Sing!")
G|----------------------------|
D|----------------------------|
A|-5h7--7775-----5-5h777775---|
E|----------7--7-----------7--|

That's it. Easy if you have the stamina