Q. As a music lover, I never fail to arrive at an opera house or concert hall well before the time given for the performance to begin. A fat lot of good it does me. Not only do things often start late, but I am trampled to death by late arrivals.

Some theaters have policies about not seating anyone during the music and others do not. I rarely get to enjoy a full overture for all the people walking on my feet to get to their places.

What do you think is a good policy, and how does someone who cares about manners, but also about music, behave when already seated while others traipse in at their leisure?

You're not going to tell me I should stand up to let them pass, are you? I feel I'm doing more than is humanly possible when I just refrain from giving them a good smack on the backside as they pass.

A. Miss Manners sympathizes with you; she does not believe that operas have overtures in order to provide in considerate people with incidental music to find their seats by. She heartily endorses the strict rules that some halls and theaters have against seating latecomers until there is a natural break in the program.

It is impossible, however, for an individual member of an audience to be the sole keeper of such a policy. Stabling violators in the backside under cover of darkness only adds to the distractions it seeks to eliminate. You must put your case to the management, but in the meantime, you must put your knees to one side of your seat to let these people pass.

Q. What is the difference between "Good morning" and "Good day?" Is there any?

A. Yes, indeed. "Good morning" is an opener, and "Good day" is a closer.

Although "Good morning" can be purely a greeting, to which only the same words are expected as a reply, this function, for the most part, has been replaced by "Hi," Therefore, "Good morning" usually leads to "How are you?" and other such mild conversational excursions.

Good day," an extremely useful expression, is less often employed. With the proper tone, perhaps expanded to, "I wish you a good day, sir," it means "Get out of my sight this instant" in the language of irreproachable manners.