Alternatim refers to a technique of

liturgical Liturgy is the customary public ritual of worship performed by a religious group. As a religious phenomenon, liturgy represents a communal response to and participation in the sacred through activities reflecting praise, thanksgiving, remembra ...

musical performance, especially in relationship to the Organ Mass, but also to the

Hymns A hymn is a type of song, and partially synonymous with devotional song, specifically written for the purpose of adoration or prayer, and typically addressed to a deity or deities, or to a prominent figure or personification. The word ''hymn'' ...

Magnificat The Magnificat (Latin for "y soulmagnifies he Lord) is a canticle, also known as the Song of Mary or Canticle of Mary, and in the Byzantine Rite as the Ode of the Theotokos (). Its Western name derives from the incipit of its Latin text. This ...

and ''

Salve regina The "Salve Regina" ( , ; meaning "Hail Queen"), also known as the "Hail Holy Queen", is a Marian hymn and one of four Marian antiphons sung at different seasons within the Christian liturgical calendar of the Catholic Church. The Salve Regina ...

'' traditionally incorporated into the

Vespers Vespers /ˈvɛspərz/ () is a Christian liturgy, liturgy of evening prayer, one of the canonical hours in Catholic (both Latin liturgical rites, Latin and Eastern Catholic liturgy, Eastern Catholic liturgical rites), Eastern Orthodox, Oriental O ...

and other liturgies of the

Catholic Church The Catholic Church (), also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.27 to 1.41 billion baptized Catholics Catholic Church by country, worldwid ...

. A specific part of the

ordinary of the Mass The ordinary, in Catholic liturgy, Catholic liturgies, refers to the part of the Mass (liturgy), Mass or of the canonical hours that is reasonably constant without regard to the date on which the service is performed. It is contrasted with the ' ...

(such as the

Kyrie ', a transliteration of Greek , vocative case of ('' Kyrios''), is a common name of an important prayer of Christian liturgy, also called the ( ; ). In the Bible The prayer, , "Lord, have mercy" derives from a Biblical phrase. Greek , ...

and the

Gloria Gloria may refer to: Arts and entertainment Music Christian liturgy and music * Gloria in excelsis Deo, the Greater Doxology, a hymn of praise * Gloria Patri, the Lesser Doxology, a short hymn of praise ** Gloria (Handel) ** Gloria (Jenkins ...

) would be divided into ''versets''. Each verset would be performed

antiphonal An antiphonary or antiphonal is one of the liturgical books intended for use (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 L ...

ly by two groups of singers, giving rise to polyphonic settings of half of the text. One of these groups may alternatively have consisted of a soloist, a group of instruments, or

organ Organ and organs may refer to: Biology * Organ (biology), a group of tissues organized to serve a common function * Organ system, a collection of organs that function together to carry out specific functions within the body. Musical instruments ...

. The missing even- or odd-numbered verses were supplied by plainchant or, perhaps more commonly (to judge by the

organ mass The French Organ Mass is a type of Low Mass that came into use during the Baroque era. Essentially it is a Low Mass with organ music playing throughout: part of the so-called alternatim practice. History The French Organ Mass is a classic example ...

es of

Hans Buchner Hans Buchner (also Joannes Buchner, Hans von Constanz; 26 October 1483 – March 1538) was a German organist and composer. Biography Buchner was born on 26 October 1483 in Ravensburg. He was a student of Paul Hofhaimer, and may have worked for ...

), by

improvisation Improvisation, often shortened to improv, is the activity of making or doing something not planned beforehand, using whatever can be found. The origin of the word itself is in the Latin "improvisus", which literally means un-foreseen. Improvis ...

s on the organ.. See also Arnaldo Morelli,
The role of the organ in the performance practices of Italian sacred polyphony during the Cinquecento
, '' Musica Disciplina'', 50 (1996), pp. 239-270. The

verso ''Recto'' is the "right" or "front" side and ''verso'' is the "left" or "back" side when text is written or printed on a leaf of paper () in a bound item such as a codex, book, broadsheet, or pamphlet. In double-sided printing, each leaf h ...

became a particularly prevalent genre in

Renaissance The Renaissance ( , ) is a Periodization, period of history and a European cultural movement covering the 15th and 16th centuries. It marked the transition from the Middle Ages to modernity and was characterized by an effort to revive and sur ...

and

Baroque The Baroque ( , , ) is a Western Style (visual arts), style of Baroque architecture, architecture, Baroque music, music, Baroque dance, dance, Baroque painting, painting, Baroque sculpture, sculpture, poetry, and other arts that flourished from ...

organ music, both

Italian Italian(s) may refer to: * Anything of, from, or related to the people of Italy over the centuries ** Italians, a Romance ethnic group related to or simply a citizen of the Italian Republic or Italian Kingdom ** Italian language, a Romance languag ...

and Iberian, and most of the

French classical organ The French organ school formed in the first half of the 17th century. It progressed from the strict polyphonic music of Jean Titelouze (c. 1563–1633) to a unique, richly ornamented style with its own characteristic forms that made full use of ...

literature consists of alternatim versets. A large amount of musical repertoire was specifically written for alternatim performance, with

Heinrich Isaac Heinrich Isaac (ca. 1450 – 26 March 1517) was a Netherlandish composer of south Netherlandish origin during the Renaissance era. He wrote masses, motets, songs (in French, German and Italian), and instrumental music. A significant contemporar ...

and Charles Justin (1830–1873) as notable composers. Alternatim performance of the Mass was common throughout Europe in the seventeenth, eighteenth, and nineteenth centuries. A similar tradition of alternatim performance existed for example also for Magnificat compositions. Documentation in

England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

is rather slight. The organ involved seems to have been a man-portable instrument, of 1 or so speaking ranks. There is no evidence for the use, in alternatim, of the larger "standing" (on a loft or platform) organ of the English Cathedral. In the

, the practice was banned by Pope

Pius X Pope Pius X (; born Giuseppe Melchiorre Sarto; 2 June 1835 – 20 August 1914) was head of the Catholic Church from 4 August 1903 to his death in August 1914. Pius X is known for vigorously opposing Modernism in the Catholic Church, modern ...

in his 1903 Motu proprio ''Tra le Sollecitudini''.Tra le Sollecitudini – Instruction on Sacred Music
/ref> The practice did, however, inform the works of

Olivier Messiaen Olivier Eugène Prosper Charles Messiaen (, ; ; 10 December 1908 – 27 April 1992) was a French composer, organist, and ornithology, ornithologist. One of the major composers of the 20th-century classical music, 20th century, he was also an ou ...

, who wrote pseudo-versets for his many liturgical organ works, especially his ''

Messe de la Pentecôte ''Messe de la Pentecôte'' ("Pentecost Mass") is an organ mass composed by Olivier Messiaen in 1949–50. According to the composer, it is based on twenty years of improvising at Église de la Sainte-Trinité, where Messiaen was organist since ...

'' (1950).

References

Christian liturgical music Music performance {{Classical-music-stub