Glad the Oldham Tinkers were mentioned. Their patter often exceeds the ammount of time spent on songs but it is well worth it. Absolute masters of it:-) My favourites - most of 'em but some snippets from much longer tales -

We called our dog Grieg. All he could do were pee agin t'suite.

(Commenting on finding a gravestone by the side of the road) Bloke buried 'ere had a good innings. 195. Feller called Miles from London.

I still laugh...

:D