God Spy Salve Regina: Hail Holy Queen 2.8 million views…Gregorian hymn chant in honor of Mary, Mother of God. February 18, 2019February 18, 2019 stephen ryan 3339 Views Gregorian hymn chant of Roman Catholic Christian Church in honor of Mary, Mother of God. It is also a common prayer to the Virgin Mary; usually recited at the end of the rosary. Share this:FacebookXLike this:Like Loading...