They are analogous to the Gregorian Introit. This is in contrast to some of the other singing such as the Introit. The first movement uses the traditional text Introit and Kyrie from the Requiem. The male schola sings the Gregorian introit and communion each Sunday. The performance included the world premieres of "Introit" and "Epilogue" by Mack Wilberg. It is similar to "Puer Natus", the chant used for the Introit for Christmas Day. Another name is Quasimodo Sunday, from the first words of the introit in Latin. After the Introit a Latin prose was sung. The "Ingressa" corresponds to the Introit in the Roman rite. They may be used during Mass, for the Introit, the Offertory or the Communion. Later editions added the Introit, Gradual, and other parts of the Mass. The album opens with "Introit", is an instrumental intro. Unlike the Introit, the Ingressa has no psalm verse or doxology. The first movement consists of the Introit from the Requiem ("Requiem aeternam") and the Kyrie. In Ambrosian chant and Beneventan chant, the counterpart of the Introit is called the "ingressa".