From Easter Sunday until the Saturday before Trinity Sunday the anthem that we sing to Our Lady is the Regina Caeli(“Queen of heaven”) This beautiful chant, dates back to the 12th century. In the above video, it is sung by the Benedictine monks of Santo Domingo de Silos.
There are copies of the setting and translation available at the back of the Church and here is a link where you can download a copy of the music, text and translation if you wish.