Let's kill this dead horse, eh?

The Pub With No Beer was written by Gordon Parsons but was inspired by Dan Sheahan's original version, A Pub Without Beer, which is documented by Dan Sheahan's song, How The Pub Without Beer Came To Be Written.
The subtle differences and nuances are easy to see on this page with all three songs by both writers:

http://wtv-zone.com/phyrst/audio/nfld/04/pubnobeer.htm