The main riff played by Bryan throughout the song is:

e|---------------------------------------------------|
B|---------------------------------------------------|
G|--7-7-5---2-2-3--------------5-55555----5-55555----|
D|--7-7-5---2-2-3-------3------5-55555----5-55555----|
A|--5-5-3---0-0-1---3h5---5p3--3-33333----3-33333----|
E|---------------------------------------------------|

figured it out by ear so if it doesn't sound right PM me or email me with suggestions/comments:
calum.barrow@btopenworld.com