Yeah.. easy.. you can keep on adding stuff to old trad songs no problem.
like f'rinstance that one about the grumpy old bloke who comes home and finds his mrs in bed
with that young fella Matty Groves.
Right, so after the big bloody sword fight and everyone is stabbed and dies..

well anyone can make up a new verse like eg. the old bloke is on the run from the police
and holes up in a pub with a sexy young waitress,
make that twins, both red heads..
..and then theres another big gory fight with their dad the pub landlord, and a shoot-out with the cops and a horse chase,
and then the ghost of his mrs can come back and haunt him
and drive him mad and he falls out a window and gets impaled
on an iron fence, or something like that.

Then one of the sexy twins sells her story to a sunday newspaper
and gets a job as a model and gets very rich
and her own reality TV show.

And thats the beauty of Traditional Song.

In another 100 years someone else can add a verse about all the dead ghosts
coming back to haunt the sexy model when she's an old lady
and she goes mad and kills everyone in a local shopping mall..

or something like that...????