Yes, probably "not like that every night" (I've not been in for a while myself) but it does seem to be much more that way compared to the days of old.

Sunday afternoon sessions are still more relaxed with an "older crowd" and I believe Wednesday is good too. It clashes with the folk club though.

I remember Sandy Bell's as far back as the seventies(I was a relative latecomer and my first folkie pub was The Waverley... I also visited the likes of The Nicky Tams, Yellow Carvel, Cottars Howff, various establishments in Royal Terrace and many more. Folk *singing* was very popular back then)

In those days, the music was less organised and often spontaneous although some nights would attract a fairly regular crowd of musicians and followers.
The popularity of the pub declined slightly during the early eighties after Jimmy Cairney's time and when Maureen(known to regulars as The Phantom Belle) took over. After that, Mary was the manager for a few years. She was a good soul but her hands were tied by the brewery.

Things improved greatly when Tommy and Charlie Woolley took charge in the mid eighties. Charlie was later to become sole owner and the pub went through a very good period during that time..especially as regards music, sessions, and even the beer improved greatly.

New management again and they are doing their best I'm sure but I think the pub has a slightly different feel these days.
However, as I said, nothing ever stands still nor should we expect it to do so.