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

Am (x02210@1)     GSay (320003@1)that you stay a little
Am (x02210@1)          GDon't (320003@1)say bye bye tonight
Am (x02210@1)          GSay (320003@1)you'll be mine just a little of bit of
Clove (x32010@1)Is worth a moment of your time

Am (x02210@1)             Gknocking (320003@1)on your door just a little
Am (x02210@1)        Gso (320003@1)cold outside tonight
Am (x02210@1)               Glet's (320003@1)get the fire burning
CI (x32010@1)know, I keep it burning right

BmIf (x24432@1)you stay, won't you stay - stay
*(hit this Bm with some power!)

Am (x02210@1)             Gsave (320003@1)room for my love
Am (x02210@1)             Gsave (320003@1)room for a moment to be with me
Am (x02210@1)             Gsave (320003@1)room for my love save a little
Csave (x32010@1)a little for me
won't you save a little

Bmsave (x24432@1)a little for me - ohh