I agree that it's courteous to give an indication what a thread is about. It's irritating to see a column of threads with no indication of what sort they are, and we all lose out in the process.

But BS only seems appropriate if you're starting a jokey social. If it's setting out to be a serious discussion about life and death things, somehow BS seems wrong, and I'm sure that's one reason why a lot of threads don't use it.

Of course, though the official prefixes are there, there's nothing to stop us adding our own if we feel like it, to let people know what in your mind.

Though thread drift can always mean that something that is serious turns social and frivolous, or the other way round, and non-music threads are always prone to turn into music threads, and the other way round here as well. A discussion about Lord Musgrove can turn into one about violent husbands, and the Cruel Mother could get into infanticide and so forth.

And the other gap is a conventional prefix for a thread that is trying to hunt down the history and meaning of a song. Which are in the last resort maybe the most valuable threads of all.

So I suggest we go for the form "Disc: I hate cars" or whatever, if it's a serious (initially serious anyway) discussion we are after, and leave BS for the social and the frivolous. And maybe "Song inf?:My Old Man's a Dustman" And take it from there. At some point a convention will develop, and we can live within it... or ignore it. (I'd sooner not have more sets of initials. That's a personal quirk that I would be happy to seek to justify if need be.)