It is just a prayer that honors the Virgin Mary and seeks her intercession. The precise timing of when it really is prayed may range dependant upon person or Group procedures. The hymn is sung (using the English translation "Hail, Holy Queen enthroned above") by a choir of nuns from https://encapsuladosvip.com/vita-pro-nobis-descubra-os-beneficios-dessa-incrivel-planta-medicinal/