Incidentally, I've just been thinking about the now departed and sadly missed Edinburgh singing duo "Liz and Maggie Cruickshank" who I reckon would have taken a very similar view to Barbara.

They weren't that keen on the tunes either but were happy enough for them to exist at the right time and place.. i.e. not to clash with the singing.
Also, while they actually encouraged singers and singers they would also be critical of those who were really bad or didn't follow proper etiquette.

They knew all about Sandy Bell's too. ;-))

https://youtu.be/ZgnhLpV2-Rk