To learn the Proper of the Mass from the Roman Gradual, consider purchasing the collection of Gregorian recordings by Schola Bellarmina: Every Gregorian chant of the liturgical year, professionally recorded
Hymns:
Alma Redemptoris Mater – simple tone (Advent to Feb 3)
Ave Regina Caelorum – simple tone (Feb 3 to Holy week)
Regina Caeli – simple tone (Easter to Pentecost)