On arriving, the congregation typically disperse along the perimeter of the peristil. The ritual often begins with Roman Catholic prayers and hymns. This is followed by the shaking of the "asson" rattle to summon the lwa. Two Haitian Creole songs, the Priyè Deyò ("Outside Prayers"), may then be sung, lasting from 45 minutes to an hour. The main lwa are then saluted, individually, in a specific order. Legba always comes first, as he is believed to open the way for the others. Each lwa may be offered either three or seven songs, which are specific to them.