Analysis of Three Songs To The Same Tune

I
GRANDFATHER sang it under the gallows:
' Hear, gentlemen, ladies, and all mankind:
Money is good and a girl might be better.
But good strong blows are delights to the mind.'
There, standing on the catt,
He sang it from his heart.
Those fanatics all that we do would undo;
Down the fanatic, down the clown;
Down, down, hammer them down,
Down to the tune of O'Donnell Abu.
'A girl I had, but she followed another,
Money I had, and it went in the night,
Strong drink I had, and it brought me to sorrow,
But a good strong cause and blows are delight.'
All there caught up the tune:
'On, on, my darling man'.
Those fanatics all that we do would undo;
Down the fanatic, down the clown;
Down, down, hammer them down,
Down to the tune of O'Donnell Abu.
'Money is good and a girl might be better,
No matter what happens and who takes the fall,
But a good strong cause' -- the rope gave a jerk there,
No more sang he, for his throat was too small;
But he kicked before he died,
He did it out of pride.
Those fanatics all that we do would undo;
Down the fanatic, down the clown;
Down, down, hammer them down,
Down to the tune of O'Donnell Abu.

II
Justify all those renowned generations;
They left their bodies to fatten the wolves,
They left their homesteads to fatten the foxes,
Fled to far countries, or sheltered themselves
In cavem, crevice, hole,
Defending Ireland's soul.
'Drown all the dogs,' said the fierce young woman,
'They killed my goose and a cat.
Drown, drown in the water-but,