Royal Court Band
A band of the Emerald City in white uniforms with diamond buttons, so called because its members all live in the palace.
First named in Dorothy and the Wizard in Oz, ch. 17
Another band after this, which was called the Royal Court Band
What the books say it is
wears white uniforms with diamond buttons 1 chapter
There followed another band after this, which was called the Royal Court Band, because the members all lived in the palace. They wore white uniforms with real diamond buttons and played "What is Oz without Ozma" very sweetly.
Dorothy and the Wizard in Oz, ch. 17