This was back in my student days, so around the early 90s. Memories are somewhat hazy, but I think the pub in question may have been called The Rainbow, and is now long gone.
There were three of us. Me, Leon, and Big Welsh. We did a bit of a pub crawl. No particular reason or occasion, we just liked going to pubs. We were on our way back to campus, heading through Digbeth in Birmingham, a fairly strongly Irish area. And we were walking right past the doorway to a pub. Seemed rude to just walk past, so we decided to pop in for just the one. No, not that sort of 'just the one', it was late, and we were on our way back home.
It was very much a Guinness pub. Pints lined up to settle along the bar. Perhaps somewhat controversially, they let them settle, then cut the heads off with a knife before serving. Leon and I loved stout, but Big Welsh didn't, so we ordered two Guinnesses and a Newcastle Brown. Sat down, and had a nice drink in what seemed like a very friendly little pub. Not at all 'studenty', seemed to be very much a locals' place, where everyone knew everyone, but they also seemed very welcoming - not always the case for students, but usually places would make it pretty obvious if they din't want you there, and we'd take a hint and leave quickly. We had our one round, and left, sure we'd be back.
As it happened, we weren't back very soon - just didn't happen to head that way. It wasn't really on the way to anywhere else we wanted to go. Around three weeks later, we finally decided to take the walk out there just to go to that pub.
We arrived, and as we got to the bar, the barmaid put two Guinness and a bottle of Newcastle Brown on the bar and said "Same again lads?"
We grinned at each other and found ourselves a table.
A short time later, someone at a table in a corner produced some sort of musical instrument - I forget what - and started playing and singing. A while later, someone else came in with another instrument, and joined in. A band gradually formed over a couple of hours. Not anything *organised* as far as we could tell, it just seemed to happen. There was no stage, they stayed sitting around the same table.
Just as we we'd decide this round would be our last, one of the bar staff stopped at our table and leaned in close to tell us that if we wanted to stay for a while after closing time, we should head through to the back room before they called time. Well, we may have been students, but we did have *some* manners. Turning down a lock-in would be far too rude.