Sugestões 

G/D: xx0033
G/D (var): x55033 (esta é mais "ousada" mas mais sonora)
G/D (var): xx0433
G6:  322003

G                               
Here's the thing 
                       Am
We started out friends
Em                                  F
It was cool, but it was all pretend
G
Yeah yeah
Am                Em   F
Since you've been gone

G                               Am
You dedicated you took the time
Em                            F
Wasn't long till I called you mine
G
Yeah Yeah
Am                Em
Since you've been gone

G                 
And all you'd ever hear me say 
    Am            Em
Is how I pictured me with you
        F             G6            
That's all you'd ever hear me say

                 Bm        C                     
But since you've been gone
G      Bm             C     G
I can breathe for the first time
             Em
I'm so movin on 
C    G
Yeah yeah
          Am 
Thanks to you
      Em
Now I get
       D/F#  Am
What I want
                   G
Since you've been gone

G                                Am
How can I put it, you put me on
Em                          F    G
I even fell for that stupid love song
G
Yeah yeah
Am                Em    F
Since you've been gone

                 G
How come I never hear you say
Am           Em
I just wanna be with you
F                G6
Guess you never felt that way


                       Bm   C 
But since you've been gone
G     Bm               C     G
I can breathe for the first time
       Bm
I'm so movin on
C    G
Yeah yeah
          Am
Thanks to you
       Em
Now I get  
             D/F#  Am
I get what I want
                  G/D
Since you've been gone

G/D                     Em
You had your chance you blew it
G/D                   G
Out of sight, out of mind
G/D                    Em                
Shut your mouth I just can't take it
G/D                            G
Again and again and again and again

...G6...

Am                Bm        C
But since you've been gone
G     Bm               C     G
I can breathe for the first time
Am           Bm
I'm so movin on
C    G
Yeah yeah
          Am
Thanks to you (thanks to you)
       Em
Now I get
             D     C
I get what I want
G     Bm               C     G
I can breathe for the first time
       Bm
I'm so movin on
C     G
Yeah yeah
          Am
Thanks to you (thanks to you)
      Em
Now I get (I get)
           Am
You should know (you should know)
       Em
What I get 
             D/F#   Am
I get what I want

...A9...

G/D
Since you've been gone
G/D
Since you've been gone
G/D  
Since you've been gone