I couldn't find a song with the title "Ghost of Molly McGuire." Somebody posted one called Sons of Molly (click here), and I'll betcha that's your song.
Could you really be looking for a U2 song? Well, it's Irish, I guess. It's also one of my favorites.
-Joe Offer-
I STILL HAVEN'T FOUND WHAT I'M LOOKING FOR
U2
1988.
I have climbed the highest mountains
I have run through the fields
Only to be with you
Only to be with you
I have run I have crawled
I have scaled these city walls
Only to be with you
But I still haven't found
What I'm looking for
But I still haven't found
What I'm looking for
I have kissed honey lips
Felt the healing in her fingertips
It burned like fire
This burning desire
I have spoke with the tongue of angels
I have held the hand of a devil
It was warm in the night
I was cold as a stone
But I still haven't found
What I'm looking for
But I still haven't found
What I'm looking for
I believe in the Kingdom Come
Then all the colours will bleed into one
But yes I'm still running
You broke the bonds
You loosed the chains
You carried the cross
And my shame
And my shame
You know I believe it
But I still haven't found
What I'm looking for
But I still haven't found
What I'm looking for
I'm sincerely hoping that the butterfly song you're looking for isn't this one (click), but maybe this one (click) will help a bit.