These people have choreographed dances in elaborate costumes that usually tell a short story. Following the "comissão de frente" is the first float of the samba school, called "abre-alas" ("Opening Wing"). These are followed by the Mestre-sala and Porta-Bandeira ("Master of Ceremonies and Flag Bearer"), with one to four pairs, one active and three reserve, to lead the dancers, which include the old guard veterans and the "ala das baianas", with the drum line battery at the rear and sometimes a brass section and guitars.