"The liturgist and composer Joseph Gelineau once said that liturgical music is not an end in itself, but a way of entering, through music, into the mystery of salvation. The heart of this mystery is the Pasch: the Passion and death of the Lord Jesus, leading to his Resurrection, Ascension, and sending of the Holy Spirit—the center of the Church’s liturgical year. All the other celebrations of the year either lead up to it, or flow from it. Jesus rose on a Sunday, the first day of the week, and each Sunday is a celebration of the Resurrection, but at Eastertide, the celebration is extended, not only for a week, but for fifty days—a week of weeks."