cornet, coronet

Cornet or cornet means a horn something like a trumpet or bugle--
"Seventy-six trombones led the big parade, with a hundred and ten cornets right behind..."
He practiced playing his cornet until he was good enough to join a combo.

Coronet or coronet means a sort of tiara or crown, a small one that doesn't make a complete circle--
British stamps and money show the queen wearing a coronet.
A coronet is usually only worn by royalty.

Now that you know that, you can say--
"A page playing a cornet announced the entrance of the queen wearing her coronet."

Note--a "cornet" is sometimes called a "cornetto"--
When he saw the old cornetto in a shop window, he knew he wanted to learn to play it.
Note # 2--a "cornet" is also a paper cone used to hold candy, or a pastry cone used to hold ice cream--
The tree had a cornet of candy for each child.
Note # 3--a "cornet" or "cornette" is also a cone-shaped headdress or hat--
She wore a medieval princess costume, complete with a cornette and veil.