However, there are a few possibilities:
* "Fanfare": This is a general term for a short, loud, and often ceremonial piece of music played on brass instruments. It is commonly used to announce the arrival of important figures.
* "Trumpet Voluntary" by Jeremiah Clarke: This is a popular choice for ceremonial occasions, and it was often played when the Queen entered a room.
* The National Anthem: "God Save the Queen" (or "God Save the King") is naturally a prominent choice for the Queen's arrival.
It's important to note that the music played would vary depending on the occasion and the specific event.