What is the Latin phrase Mary sings in the Mass?

The Latin phrase that Mary sings in the Mass is "Magnificat anima mea Dominum," which translates to "My soul magnifies the Lord." This phrase is part of the Magnificat, a canticle from the Gospel of Luke (1:46-55) that Mary sings in response to her visit from the Angel Gabriel. It is often recited or sung during the Evening Prayer (Vespers) in the Liturgy of the Hours and is also included in the Catholic Mass.