Would this be the one? It goes to the tune of Messing About On The River at any rate.

If you're out on the town, why don't you go down and hear the folksingers at Blither.
If you've no strict aversion to music's diversion, then make the excursion to Blither.
There are all kinds of wonderful folksingers there who can't hold a note and can't hum an air.
They get their folksongs from Christ only knows where. And you'll hear every last one at Blither.

To the musical ear it's painful to hear the excruciations of Blither.
If you've taste and decorum you'll surely deplore 'em when you hear the singers at Blither.
There are singers who sing in a hushed monotone and singers who bawl in a hideous moan.
By the end you'll be singing a heartfelt ochone for the night that you spent down at Blither.

They have an MC who, for barbarity beats Attila the Hun down at Blither.
In manner chaotic and behaviour despotic he rules the proceedings at Blither.
He'll call you to sing while you're out for a leak and then says I'm sorry, just come back next week.
God help you if you aren't one of that clique, who sing all the folksongs at Blither.

Don't stand too near the door or one night I am sure you're bound to get flattened at Blither.
For the thunderous horde don't wait till you applaud, they storm straight on board down at Blither.
They take up their seats in the midst of the song and sit there and natter the whole evening long.
And look at you as if you don't quite belong, when you call for some order at Blither.

Of drunks I've seen them all, but I just can't recall where you'd find a profusion like Blither.
They roll in through the door and they fall on the floor. You can't move for the buggers at Blither.
They snore somnambulistically all through the night, then wake and invite everybody to fight.
Then stagger off home without saying 'Goodnight'. They've such elegant manners at Blither.

The night of the fight you'd have sworn that the blight must have cast its long shadow on Blither.
For the corpses in piles lay stacked up for miles on the cobbles and tiles around Blither.
Though no-one remembers who fired the first shot and blinds have been drawn over what started what,
The count of the carnage will ne'er be forgot, when they slaughtered each other at Blither.

It's like going to mass, for they pass round the glass. to enhance the finances of Blither.
With the clinking of tin as the money goes in, they drown out the singing at Blither.
But the audience there think that it's quite alright. They don't start to fuss and they don't start to fight.
For they reckon that it's the best part of the night, when you can't hear the singers at Blither.

You may ask me true if I'll advise you on avoiding the singers at Blither.
No policy devious or engagement previous do you need to steer well clear of Blither.
I know that it sounds most distinctly severe, but make one resolution to never go near.
And I promise you that your censorious ear won't suffer the singers at Blither.