Throughout the year, the Church prays different Marian Antiphons based on the proper liturgical season. We’ll post the current Antiphon throughout the year:
Advent/Christmas: Alma Redemptoris Mater
Lent: Ave Regina Caelorum
Easter: Regina Caeli
Pentecost: Salve Regina
Here’s a great article about the different seasons, highlighting the Regina Caeli, which is sung through the Octave of Pentecost.
The four Marian Antiphons have traditionally been sung at the end of Compline – each one during a particular season of the Church Year. Regina Caeli is sung from Easter Eve until Pentecost.
Here’s the antiphon sung to the Simple Tone by the Benedictine monks of Santo Domingo de Silos. Chant score from the Liber Usualis (1961), p.278. (English translation below.)
Here’s the chant score of the Simple Tone version, from the Liber Usualis:
Here it is sung to the Solemn Tone, by the Benedictine Monks of the Abbey of Saint Maurice et Saint Maur de Clervaux. (Chant score from the Liber Usualis (1961), p. 275.)