Liber Usualis
Encyclopedia
The Liber Usualis is a book of commonly used Gregorian chant
Gregorian chant
Gregorian chant is the central tradition of Western plainchant, a form of monophonic liturgical music within Western Christianity that accompanied the celebration of Mass and other ritual services...

s in the Catholic tradition, compiled by the monks of the Abbey of Solesmes in France.

This 1,900-page book contains most versions of the ordinary chants for the Mass
Mass (liturgy)
"Mass" is one of the names by which the sacrament of the Eucharist is called in the Roman Catholic Church: others are "Eucharist", the "Lord's Supper", the "Breaking of Bread", the "Eucharistic assembly ", the "memorial of the Lord's Passion and Resurrection", the "Holy Sacrifice", the "Holy and...

 (Kyrie
Kyrie
Kyrie, a transliteration of Greek κύριε , vocative case of κύριος , meaning "Lord", is the common name of an important prayer of Christian liturgy, which is also called the Kýrie, eléison ....

, Gloria
Gloria in Excelsis Deo
"Gloria in excelsis Deo" is the title and beginning of a hymn known also as the Greater Doxology and the Angelic Hymn. The name is often abbreviated to Gloria in Excelsis or simply Gloria.It is an example of the psalmi idiotici "Gloria in excelsis Deo" (Latin for "Glory to God in the highest")...

, Credo
Credo
A credo |Latin]] for "I Believe") is a statement of belief, commonly used for religious belief, such as the Apostles' Creed. The term especially refers to the use of the Nicene-Constantinopolitan Creed in the Mass, either as text, Gregorian chant, or other musical settings of the...

, Sanctus
Sanctus
The Sanctus is a hymn from Christian liturgy, forming part of the Order of Mass. In Western Christianity, the Sanctus is sung as the final words of the Preface of the Eucharistic Prayer, the prayer of consecration of the bread and wine...

, and Agnus Dei), as well as the common chants for the Divine Office
Liturgy of the hours
The Liturgy of the Hours or Divine Office is the official set of daily prayers prescribed by the Catholic Church to be recited at the canonical hours by the clergy, religious orders, and laity. The Liturgy of the Hours consists primarily of psalms supplemented by hymns and readings...

 (daily prayers of the Church) and for every commonly celebrated feast of the Church Year (including more than two hundred pages for Holy Week alone). The "usual book" or "common book" also contains chants for specific rituals, such as baptisms, weddings, funerals, ordinations, and benediction. This modal, monophonic Latin music has been sung in the Catholic Church since at least the sixth century and through the present day.

An extensive introduction explains how to read and interpret the medieval musical notation (square notation of neums or neume
Neume
A neume is the basic element of Western and Eastern systems of musical notation prior to the invention of five-line staff notation. The word is a Middle English corruption of the ultimately Ancient Greek word for breath ....

s). A complete index makes it easy to find specific pieces.

The Liber was first edited in 1896 by Solesmes abbot Dom André Mocquereau (1849–1930). After the Second Vatican Ecumenical Council (opened by Pope John XXIII
Pope John XXIII
-Papal election:Following the death of Pope Pius XII in 1958, Roncalli was elected Pope, to his great surprise. He had even arrived in the Vatican with a return train ticket to Venice. Many had considered Giovanni Battista Montini, Archbishop of Milan, a possible candidate, but, although archbishop...

 in 1962) allowed in the constitution on the liturgy Sacrosanctum Concilium
Sacrosanctum Concilium
Sacrosanctum Concilium, the Constitution on the Sacred Liturgy, is one of the constitutions of the Second Vatican Council. It was approved by the assembled bishops by a vote of 2,147 to 4 and promulgated by Pope Paul VI on December 4, 1963...

the vernacular (local language) to be used in Church rites, its use has decreased, although the same council mandated that Gregorian Chant should retain "pride of place" in the liturgy (Sacrosanctum Concilium
Sacrosanctum Concilium
Sacrosanctum Concilium, the Constitution on the Sacred Liturgy, is one of the constitutions of the Second Vatican Council. It was approved by the assembled bishops by a vote of 2,147 to 4 and promulgated by Pope Paul VI on December 4, 1963...

, 116.). Gregorian chants are still sung in most monasteries and some churches and in performances by groups dedicated to its preservation.
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