Ordinary (liturgy) in the context of "Eastertide"

Order of Mass is an outline of a Mass celebration, describing how and in what order liturgical texts and rituals are employed to constitute a Mass.

The expression Order of Mass is particularly tied to the Roman Rite where the sections under that title in the Roman Missal also contain a set of liturgical texts that recur in most or in all Eucharistic liturgies (the so-called invariable texts, or ordinary of the Mass), while the rubrics indicate the rituals, and the insertion points of the variable texts known as the proper of the Mass. Having been virtually unchanged for many centuries, the Roman Catholic Order of Mass changed decisively after the Second Vatican Council.

The Mass (Latin: missa, Italian: messa, French: messe, German: Messe) is a form of musical composition that sets the invariable portions of the western Christian Eucharistic liturgy (principally that of the Catholic Church, the Anglican Communion and Lutheranism) known as the Mass.

Most Masses are settings of the liturgy in Latin, the sacred language of the Catholic Church's Roman Rite, but there are a significant number written in the languages of non-Catholic countries where vernacular worship has long been the norm. For example, there have been many Masses written in English for a United States context since the Second Vatican Council, and others (often called "communion services") for the Church of England.

The Sanctus (Latin: Sanctus, "Holy") is a hymn in Christian liturgy. It may also be called the epinikios hymnos (Greek: ἐπινίκιος ὕμνος, "Hymn of Victory") when referring to the Greek rendition and parts of it are sometimes called "Benedictus". Tersanctus (Latin: "Thrice Holy") is another, rarer name for the Sanctus. The same name is sometimes used for the Trisagion.

In Western Christianity, the Sanctus forms part of the Ordinary and is sung (or said) as the final words of the Preface of the Eucharistic Prayer of remembrance, consecration, and praise. The preface, which alters according to the season, usually concludes with words describing the praise of the worshippers joining with the angels, who are pictured as praising God with the words of the Sanctus. In the Byzantine Rite and general Eastern Orthodox Christianity, the Sanctus is offered as a response by the choir during the Holy Anaphora.

An antiphonary or antiphonal is one of the liturgical books intended for use in choro (i.e. in the liturgical choir), and originally characterized, as its name implies, by the assignment to it principally of the antiphons used in various parts of the Latin liturgical rites.

Medieval antiphonaries varied with regional liturgical tradition. In 1570, following the Council of Trent, the Roman Rite antiphonary was declared universal. The Roman Antiphonary (Antiphonale Romanum) contains the chants for the canonical hours for the hours of Lauds, Prime, Terce, Sext, None, Vespers and Compline for every day of the year. The Vesperale Romanum is an excerpt of the Antiphonary containing the chants sung at Vespers. The music for use at the Mass is contained in the Roman Gradual (Graduale Romanum), the chants of the ordinary are also edited as an excerpt from the Gradual, the Kyriale Romanum. The Antiphonale Romanum was substantially revised in 1910–11 in the course of the reform of the Roman Breviary under Pope Pius X, notably restoring authentic Gregorian melodies. For the 1971 "Liturgy of the Hours", there are two volumes, Antiphonale Romanum II and Liber Hymnarius.