How to behave in a room where music is happening.

Most of what makes a visitor welcome in these rooms has nothing to do with music. It is the ordinary business of being a guest somewhere, and it is worth saying out loud because the situations are unfamiliar enough that ordinary instincts do not always fire.

Arrive with something. Pastries, fruit, tea, sugar. Not money, not at the door. This is not a fee and it is not optional.

Take the tea. You will be given tea whether you want it or not, and it will be very sweet. Drink at least some of it. Refusing the first glass reads as a refusal of the room.

Sit lower than you think. If there are cushions on the floor and a chair, take the floor unless somebody directs you otherwise. If an older person enters, stand.

Do not clap between sections. A ceremony is not a set. Clapping marks the end of something and you are unlikely to know where the ends are. Follow the room, which will usually not be clapping at all.

Ask before you record, every time. Not once at the beginning for the whole evening — the answer can change from one section to the next, and the moments most worth recording are the ones most likely to get a no. Accept it instantly and without negotiating.

Put the phone away otherwise. This is the single most common complaint we hear from musicians about foreign visitors, ahead of everything else combined.

Do not photograph people in trance. Ever, under any circumstances, regardless of what anybody else in the room is doing.

Learn four words. Salam, shukran, bslama, and the name of the person hosting you. Nobody expects more and everybody notices.

Stay longer than is comfortable. Leaving at midnight from something that runs until five is permitted and is noticed. If you can stay to the end, stay to the end.

Say what you heard. Afterwards, to the musicians, specifically. Not that it was beautiful — what you noticed. It is the difference between applause and a conversation, and it is how people end up invited back.