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
[ Tab from: https://www.guitartabs.cc/tabs/g/glen_hansard_and_marketa_irglova/once_crd.html ]
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