You can play the "Oh" part like this (relative to the capo of course)
E|---------------------------------------------------------------|
B|---------------------------------------------------------------|
G|---------------------------------------------------------------|
D|----0--2--2--4--2--0------0--2--2--4--2--0-----0---------------|
A|-2--------------------2---------------------2-----2------------|
E|---------------------------------------------------------------|

He mostly plays the G as a barre 
Em C G


[Verse 1]

    Em                           C
I promise that one day I'll be around
                                    G
I'll keep you safe, I'll keep you sound
          Em
Right now it's pretty crazy
              C                         G
And I don't know how to stop or slow it down


[PreChorus]

 C                                            Em
Hey, I know there are some things we need to talk about
             C                                      D
And I can't stay.  So let me hold you for a little longer now


[Chorus]

  G                  C
Take a piece of my heart
                      G
And make it all your own
                 D
So when we are apart
       B7          Em
You'll never be alone 
 C               G
You'll never be alone 


[Instrumental]

Em C G
Em C G 


[Verse 2]
G
You'll never be alone
  Em                         C
When you miss me close your eyes
                        G
I may be far but never gone
          Em                       C                             G
When you fall sleep tonight just remember that we lay under the same stars


[Pre Chorus]

  C                                           Em
Hey, I know there are some things we need to talk about
             C                                        D
And I can't stay, Just let me hold you for a little longer now


[Chorus]

  G                  C
Take a piece of my heart
                      G
And make it all your own
                 D
So when we are apart
       B7          Em
You'll never be alone 
 C               G
You'll never be alone 

[Intro]

G  Bm  G  Bm


[Verse 1]

G                            Bm
Hey there Delilah, What’s it like in New York City? 
      G                               Bm
I’m a thousand miles away, But girl tonight you look so pretty, 
        Em  C                 D                  Em
Yes you do, Time Square can’t shine as bright as you, 
             D
I swear it’s true. 
G                            Bm
Hey there Delilah, Don’t you worry about the distance, 
          G                                  Bm
I’m right there if you get lonely, Give this song another listen, 
           Em    C            D                Em 
Close your eyes, Listen to my voice it’s my disguise, 
            D
I’m by your side. 


[Chorus]

G                      Em  G                      Em     D
Oh it’s what you do to me, Oh it’s what you do to me, 
G                      Em  G                      Em
Oh it’s what you do to me, Oh it’s what you do to me, 


[Instrumental]
Em C G
Em C G
Em C G
Em C G
Em C G
Em C G
Em C G


[Chorus]

  G                  C
Take a piece of my heart
                      G
And make it all your own
                 D
So when we are apart
       B7          Em
You'll never be alone 
 C               G
You'll never be alone