from; Liturgie Des Heures [Disc 8]-St. Martin's Abbey, Ligugé/ 1998/
The "Salve Regina", also known as the Hail Holy Queen, is a Marian hymn and one of four Marian antiphons sung at different seasons within the Christian liturgical calendar of the Roman Catholic Church. The Salve Regina is traditionally sung at Compline in the time from the Saturday before Trinity Sunday until the Friday before the first Sunday of Advent. The Hail Holy Queen is also the final prayer of the Rosary.
The work was composed during the Middle Ages most probably by a German monk Hermann of Reichenau and originally appeared in Latin, the prevalent language of Western Christianity until modern times. Traditionally it has been sung in Latin, though many translations exist. These are often used as spoken prayers.
http://en.wikipedia.org/wiki/Salve_regina