Something like this:

Capo 3

Ami                  G          Dmi             Emi
With a red rose in Summer, the leaves soft and green
Ami               G            Dmi          Emi
You walked without speaking your arm held in mine
Dmi                C             Emi
And the Ion dubh was singing as we passed by
Ami            G      F          Emi Ami
Bitter the parting of lovers entwined


He's playing an F in the bass over the Dmi - you could sub an F but the Dmi/F sounds better. It's pretty fluid the way John plays it, but totally workable. Mind you that hes also using an open tuning, standard tuning won't sound as rich and bass heavy.

good luck