Well this one sprang to mind straight away - okay, it's not what you'd call folk, but I'm a bit of a Queen fan, so here it is:

WE ARE THE CHAMPIONS - Queen

I've paid my dues, time after time,
I've done my sentence but committed no crime,
And bad mistakes, I've made a few.
I've had my share of sand kicked in my face but I've come through.
And I need to go on, and on, and on, and on.

Chorus:
We are the champions my friend.
And we'll keep on fighting till the end.
We are the champions. We are the champions.
No time for losers 'cause we are the champions
of the world.

I've taken my bows and my curtain calls.
You brought me fame and fortune and ev'rything that goes with it,
I thank you all.
But it's been no bed of roses, no pleasure cruise.
I consider it a challenge before the whole human race
and I ain't gonna lose.

Chorus:
We are the champions my friend.
And we'll keep on fighting till the end.
We are the champions. We are the champions.
No time for losers 'cause we are the champions
of the world.

repeat chorus