Really? One of the moderators (I seem to remember Joe Offer, but I could be wrong) said that they are, and a lot of them do seem to be. This is confusing.
BS threads are automatically closed when they have been inactive for a certain length of time. Moderators can open or close threads manually, and change the designation to BS or not-BS. Changing the designation doesn't automatically change the thread title. Adding or removing the "BS:" prefix in the thread title is optional, and the moderators usually leave it alone. (Some people are offended by having their thread title changed to BS.)This thread wasn't closed because it wasn't initially designated as a BS thread, and went into the music section by default. I think it dates back to the time before there was such a thing as a BS designation.
Some moderator apparently changed the designation to BS (as they should) after the thread was refreshed.
—JoeClone, 2-Nov-2009.