Master drummers in Brazil, called "alab", participate in an exchange of energy with dancers and audiences whose main purpose is to call on the Orixas for their blessings and bring about community healing. Similar to Cuba, the Orixas emanated from over 100 ethnic groups brought to the New World during the slave trade, but some eight main powers are traditionally worshipped at ceremonies. Each Orixa has his or her particular music, but one must always begin by saluting Elegua or Exu, the ambassador between the spiritual entities of the universe. The Brazilian ceremony is in two parts, one in which the "yawos" or the initiates dance to welcome the spirits in their heads, and the other after the orixas have taken center stage. The "avaniha" is the music played for the entrance of the yawos who retired to an interior room to be dressed in the appropriate apparel of the Orixas. After the Orixas have been dressed in their respective costumes, and handed their emblems, arms, and ritual tools, they make their grand entrance into the dancing area to the music of "agolona".