"then more tunes--this gives those people who remained quiet during the singing to have a chat"

I rest my case.

Actually that's not so much of a problem. It's when you're trying to show off your new party piece or maybe a couple of you have worked out an arrangement that you'd like people to listen to. The Pavlovian response switches in. Tunes! Talk!

As for Fnurds, if there is an accepted right way of doing things, they'll get the message eventually.