this is my interpretation of parts of the piano song. so simple yet is a awesome song! 
you enjoy it:)

intro/alternative starting riff
eI--------------------------------------------------|
bI--------------------------------------------------|
gI--------------------------------------------------|
dI---7-6-6-4---7-6-6-4---7-6-7-7--------------------|
aI---4-4-4-4---7-7-7-7---7-7-7-7-----------x--------|1 (go straight into the verse)
EI--------------------------------------------------|

main part for chorus and verses
eI--------------------------------------------------|
bI--------------------------------------------------|
gI--------------------------------------------------|
dI---7-6-6-4---7-6-6-4---7-6-6-4--------------------|
aI---4-4-4-4---7-7-7-7---7-7-7-7--------------------|
EI--------------------------------------------------|
and then you just repeat this for the entire song. there is a slight variation but not 
how to play yet but ill keep you all posted.