samba school bands have their percussion section and their diretor da bateria or percussion director, or conductor - they also have a queen whose job is to lead the drummers.

the rainha da bateria is among the most photographed participants of the parade, and many of the iconic pictures of very attractive women marching in rio's parades with minimal costumes and feathers are of rainhas.
the rainha de bateria (queen of the orquestra) is usually, as the name would imply, beautiful, charming, and a great performer.