I didn't actually tab this, my friend Haruo did. And he's amazing at tabbing. So here it 
I've tried it and its perfect!!!

"Love song" by Sara Bareilles

Piano arranged for guitar

Intro

x2 times

Verse

x4 times
(F)__Gm___Am__Bb

Chorus

x2 times
Gm__F__Dm__G7__Bb__C

Bridge
Dm__Am__Bb__F__C x2 times
Dm__A__Bb__C

Final chorus
Right after the bridge, she goes into the chorus but not with anticipated transition 
(that is to be F) but with this one instead, a sort of altered D... : xx7x5x that I call 
D*

D*

x4 times
Gm__Am__Bb__C__Dm__G__Bb__C
(F)__Gm__(Am)__Bb__(C)__Dm__(E)__F


I suggest you to play the first line of the verse [(F)__Gm__(Am)__Bb__(C)__Dm__(E)__F] 
power chords only, that means by fretting only the 4th, 5th and 6th strings and going up 
down on the neck of the guitar. The notes between (...) are transition notes that
give the jumpy groove to the track.