If you have something that you want list members to see, send it to them via email, or put it up on a webpage and then send the URL to the list. Label your posts according to content. While this isn't a set rule, it is considered polite etiquette. This would include concert reviews, album reviews, etc. If you're posting material that might spoil another person's enjoyment.
Grammy time rolls around.
Keep in mind that while everyone gets the same list mail, not everyone lives in the same time zone as you. So if you post something that spoils the outcome of an event, thinking the event is already over, the event might not have even begun for someone else yet, because they're in a different time zone. Fumblers are notorious for their love of music. Often times you'll see this at the end of a post, followed by the name of a song or CD, etc. It's usually a good idea after joining an Internet mailing list, to just sit back for a few days, or even a week, and watch the posting that goes on there.