When my daughter and I were in Edinburgh in 2019, we were having a beer in the Captain's Bar near the University.
We happened to show up on some sort of "open mic" night, as there were a number of different performers.
The most memorable was an old man; probably in his late 80's or early 90's, who started singing "Down In The Valley" a cappella.
It was one of the most beautiful things I'd ever heard...