There's also one which Dr Price quotes in the thread on Welsh Drinking songs thread.

"Yr Wyf I Little Collier"

Yr wyf i little collier
Un gweithio underground
the rope will never torri
When I go up and down
Bara menyn when I'm hungry
Cwrw when I'm dry
Gwely when I'm tired
and Nefoedd when I die

Nefoedd when I die
Nefoedd when I die
Gwely when I'm tired
and Nefoedd when I die.


yr wyf i = I am
yn gweithio = working
torri = break
bara menyn = bread and butter
cwrw = beer
gwely = bed
nefoedd = heaven

This is still current, certaily in the Merthyr Valley.

It was also sung in the recent 'Coal House at War' series on BBC Wales.