Once Chords

I'm not sure if all of this is 100% correct in terms of chord complexity, but it
works. So, here it is. 

C          Gm         F
Part of me has died
C             Gm       F
Won't return 
C           Gm            F 
Part of me wants to hide
C                    Gm                F
the part that's burned 

Am       D7      
Once, once
F                       C 
I knew how to talk to you 
Am       D7
Once, once
F                    C
But not anymore 


F                                         Am          D7 
Hear the sirens call me home x3
F                                        Am         Am 
Hear the sirens call me home 

C            Gm       F 
Part of me has died 
C                  Gm       F
To watch it burn 
C                          Gm          F
And the heart of me has tried
C                             Gm         F
Look what it's become 

Am        D7
Once, once
F                         C 
I knew how to look for you
Am       D7
Once, once
F                      C 
But that was before 
Am       D7
Once, once
F                                               C
I would have laid down and died for you
Am       D7
Once, once
F                    C
But not anymore


F                                           Am             D7
Hear the sirens call me home x 5
F                                         Am                 Am 
Hear the sirens call me home

C - Gm - F - C