I've added an alternative Intro, based on the keyboard lick, and modified it for guitar:
E --------------------------------------------------|
B -/12-10 --------------/12-10----------------------|
G --------12-11----9-12--------12-11-------9--------|
D --------------12-------------------10-12----------|
A --------------------------------------------------|
E --------------------------------------------------|
Intro
Am, G, Am, G, Am, G, C
[ Tab from: http://www.guitaretab.com/j/john-legend/80331.html ]
Am G
Say that you stay a little
Am G
Don't say bye bye tonight
Am G
Say you'll be mine just a little of bit of
C
love Is worth a moment of your time
Am G
knocking on your door just a little
Am G
so cold outside tonight
Am G
let's get the fire burning
C
I know, I keep it burning right
Bm
If you stay, won't you stay - stay
*(hit this Bm with some power!)
Am G
save room for my love
Am G
save room for a moment to be with me
Am G
save room for my love save a little
C
save a little for me
won't you save a little
Bm
save a little for me - ohh